A lot of people will add a wishlist to their profile that they use for other things Friends, Family, birthdays, holidays etc.

You can just ignore the expensive stuff and focus on the things that would be more applicable to the budget of these exchange. Maybe try to get them something related to the big stuff?

Say they have a Camping tent on their wishlist, you could get them a set of foldable utensils or camping first aid kit.

Try not to feel like you have to get only something on their wishlist.