YMMV, but Home Depot absolute does match prices in-store if you bring in a printed page from a major retailer. They have plenty of carve-outs: no auctions (eBay), club stores (Costco) or 3rd party sellers (Amazon marketplace, Walmart marketplace). But it's basically the same most price-match policies at Staples, Best Buy, Fry's, etc.

http://www.homedepot.com/c/PM_New_Lower_Price

Home Depot does price match, but you do have to watch out for the carve outs. I most recently tried to save quite a bit of money on my kitchen appliances. However, they only price match "in stock" merchandise. They had to order these units so no price match for me.