The kids go nuts for Webkinz (those stuffed animals that come with a code to access their cool website) and you can get them for about $12-15 and they're thrilled! I usually let my daughter pick one out & then we get a candy bar or something sweet to wrap up with it. No one cares what the cost is, they're just really, really happy to have one. If you live near a Learning Express, they will wrap it nicely for free, and if you join their club they keep track of your purchases & you get some of your money back at the end of the year in the form of vouchers in the store. It's a nice system because, like you, my daughter is in a big class & gets invited to tons of b-day parties.
Have fun!
D.