The worst part about buying a new pair of blue jeans used to be standing before the dressing-room mirror.

Now, when some jeans sell for up to $500, it’s standing in front of the cash register.

But buying into the latest trends in blues doesn’t have to be painful.

There are plenty of lower-priced versions of the season’s high-dollar denims out there if you know where to look.

Here, four of this fall’s most popular designer jeans -and their lower-priced dopplegangers.

Find your favorite pair -and save a ton.

POCKET-FRIENDLY

SPEND

1. Habitual light blue jeans with hip pockets, $156.

SAVE

2. Gap Long & Lean stretch jeans, on sale for $29.99.

CUFFED

SPEND

3. Joie black denim “Lady Bird” cuffed jeans, $135.

SAVE

4. Zara TRF blue denim cuffed jeans, $62.

LACE-UP

SPEND

5. Alexander McQueen jeans with leather laces, $450.

SAVE

6. Custo Barcelona “Pant Jungle” jeans with leather lace detail, $198.

CARGO

SPEND

7. Joe’s Jeans dark blue denim cargo pants, $120.

SAVE

8. Old Navy cargoes, $29.50.

Rearview blues : Even if you don’t know their brand, you probably recognize these jeans’ famous back pockets

SEVEN

$110 at Scoop

PAPER DENIM & CLOTH

$160 at Bergdorf Goodman

JOIE

$130 at Scoop

LEVIS

$110 at Urban Outfitters

DOLCE & GABBANA

$515 at Bergdorf Goodman

LIX

$150 at Bergdorf Goodman

BLUE CULT

$125 at Bergdorf Goodman