damn, i had this all writen out then forgot to post but anyway..
Have you tried designer clothes? All you have to do is undercut the highstreet and your fine, you could even buy from a cheap retail website!! I used to store pics on my phone when i was a kid.
Or ps3 and xbox 360 games get the new releases everyone wants in
and sell just under the high stree price
With regard to the usb's and laser pens try china, a try alibaba.com or dhgate.com.