Get some nice flash drives that you can get personalized paper... well you might as well just give them a 20 without a card

Ex: http://www.amazon.com/Personalized-Flash-Drive-LASER-Engraving/dp/B00G7P3SEM/ref=sr_1_1?ie=UTF8&qid=1386699231&sr=8-1&keywords=personalized+flash+drives