If you don't need anything specific, ask them to just get you a gift certificate for BPS or Tacklewarehouse (if they have them). That way, you can wait until you find something you want (or actually need) and just order it?

It's nice to just have some $$$ laying around when those new 'wonder' products come out :P But one thing that I always need that adds up quick is terminal tackle. Tungsten weights and Gammy hooks are expensive when you need to buy several packs of different sizes.