Throw a party on a budget or find a Halloween costume at the Wal-Mart of party supplies.. In Short Invitations, wrapping paper, balloons, hats, noise makers and party favors stuff this festive store, which specializes in affordable party supplies. During Halloween, the vibe turns ghoulish with creepy spiders and blinking skulls. Shelves in the "Costume Warehouse" spill with ideas: cauldrons and rubbery masks for the witches, militaristic gear for the soldiers and fairy wings for Tinkerbell. Packaged costume sets and inexpensive trick-or-treat bags make it easier to do Halloween on the cheap.