His time might be priceless, but lunch with Mayor Bloomberg is up for grabs to anyone who can spare a few thousand bucks.

In what appears to be a first, the mayor has put himself up for bid in an Internet auction to benefit the Humane Society of the US.

Current bid? A mere $6,500. Estimated value? $25,000.

There was no explanation on the Web site how the mayor’s services came to be offered.

Bids are being accepted at http://www.charitybuzz.com.