Here's a $250 Gift Certificate at the Trendy Wasteland on Melrose. Cool duds and designer finds make for a hip vintage shopping experience. Savvy buyers keep the place packed with merchandise from virtually every decade. You never know what you'll find, from couture pieces to last season's French Connection pleather slacks. Also known for their cutting-edge accessories (gold '70s chain necklaces and new Playboy-brand wallets) and the huge shoe section, which features killer castoffs such as studded red-leather sandals and Lucite-and-gold heels from such labels as Chinese Laundry.