This is a quick list of ideas for 'toys' and other developer stress relief items that are cheap and fun.
Get things to throw around and/or shoot (nerf, etc.). This is always popular, and rather cheap. Get nerf balls, nerf guns, and other things that can be thrown at people. Of course, they shouldn’t actually hurt, or have the potential to break things, but the dumb stuff can be good stress relievers. And you actually can buy these at Wal-Mart.Also consider giving everyone a toy budget, and letting them buy and bring in their own toys. Or have a standing offer to reimburse people for toys.