I can order custom 2GB USB drives and they cost about $6 apiece to make. A CD burner is about $20, plus making labels and ordering the CDs of course, and the time it takes to burn them. Assuming my sales are pretty robust, they are about both equally as cost effective as the other one.
If you had the option of physically picking up a new folio, which format would you prefer?
[/edit] Sure it's expensive, but I think we have our answer, haha. And the filesize means I can pack in high res files or animations. If I can get 20 sales at AC, really, the price of the drives will be paid back, and I think I can afford them next month.