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I almost couldn’t believe the price when I saw it.

As someone who has been testing shampoos for years, I’ve tried just about everything promising softer, shinier and healthier-looking hair. Some formulas have impressed me, others have been quickly forgotten, but one shampoo I continue to come back to is BioSilk Hydrating Shampoo. That’s why I did a double take when I spotted the jumbo 34-ounce bottle on Amazon for 65% off ahead of Prime Day.

Amazon Prime Day doesn’t officially begin until June 23, but some of the biggest beauty discounts are already popping up. This BioSilk deal immediately caught my attention because it’s not just a discount on a standard-size bottle. The sale applies to the massive 34-ounce version, which means you’re getting a lot of product for an unexpectedly low price.

There are plenty of shampoos I’ve tested once and moved on from, but BioSilk has earned a permanent spot in my rotation. The hydrating formula helps replenish moisture while leaving my hair feeling soft, smooth and easy to manage. Every time I return to it, I’m reminded why it remains one of my favorites.

Another reason I keep reaching for this shampoo is the shine it gives my hair. Some moisturizing formulas can leave strands feeling heavy, but this one strikes a balance that works well for me. My hair feels hydrated without looking flat, and it consistently leaves behind the glossy finish I’m after.

The oversized bottle makes the current sale even more appealing. With 34 ounces of product, this isn’t the kind of shampoo you’ll fly through in a few weeks. It has the potential to last for months depending on how often you wash your hair, which makes the already impressive discount feel even better.

If you’ve been holding off on beauty purchases until Prime Day, this early deal is worth a look. A 65% discount on a salon-quality shampoo that I still use after years of testing alternatives is hard to ignore. Between the hydrating formula, the shine-boosting results and the jumbo size, it’s one of the most surprising beauty bargains I’ve seen before Amazon Prime Day kicks off on June 23.

After trying countless shampoos over the years, the BioSilk Hydrating Shampoo remains the one I swear by for softness and shine, and this price drop makes stocking up especially tempting.

Prime Day is Amazon’s biggest sale of the year, offering deep discounts on bestsellers and everyday essentials. This year’s event runs from Tuesday, June 23 at 3 a.m. ET through Saturday, June 27at 3 a.m. ET.

This year, shoppers can take advantage of four days of Prime Day deals: Tuesday, June 23 at 3 a.m. ET through Saturday, June 27at 3 a.m. ET.

In addition to pushing up the sale to June, Amazon is including several new programs and promotions, including:

Prime Day and all its amazing discounts are exclusively available to Prime members. However interested shoppers can grab a 30-day free trial to try Prime, and its many benefits with no strings attached, and gain access to exclusive deals and the convenience of fast, free shipping.

From reporting on Amazon sales for years, we can tell you for certain that Prime Day is the ideal time to stock up on beauty and skincare staples, score big-ticket tech for less, bestselling vacuums, and comb through the massive catalog of Amazon best-sellers. Plus, since this year’s sale runs before the Fourth of July Americana-themed deals and summer hosting essentials.

We certainly think so! Prime Day is a great chance to score deals on thousands of best-sellers, top tech and appliances and every day essentials. Our team diligently sorts through all the offers to find you only the very best items to grab on sale.

Already wondering when Amazon’s next Prime Day is? We expect Amazon’s October Prime Big Deal Days sale event to return in fall 2026. Follow Post Wanted’s around-the-clock coverage, and you’ll be the first to know about headline-worthy sales. Click here to find all of the best deals.

This article was written by Victoria McDonnell, New York Post Commerce Journalist & Content Strategist, who has spent countless hours researching, testing hundreds of products and comparing the latest makeup, skincare, hair and beauty items and trends to determine what’s truly worth your hard-earned cash. She evaluates formulas, textures, ingredients and more, in addition to consulting medical and industry experts. Some of Victoria’s latest conquests include testing the best sheet masks on the market, and a rinse-and-repeat review of the best shampoos for all hair types and budgets. Victoria, who received a beauty industry essentials certification from the Fashion Institute of Technology, has been creating shopping guides for the New York Post since 2021 and previously held positions at Insider Reviews and CNN Underscored.