2GB
$2.20/per <– Winner
8GB
Purple 8GB @ $2.55
http://www.gearbest.com/usb-flash-drives/pp_252699.html
Black 8GB USB @ $2.60/per
http://www.gearbest.com/usb-flash-drives/pp_281501.html
Gold 8GB USB @ $2.63/per
http://www.gearbest.com/usb-flash-drives/pp_254087.html
Mini 8GB USB @ $3.53/per
http://www.dx.com/p/sandisk-cruzer-fit-8gb-usb-2-0-low-profile-flash-drive-sdcz33-008g-852335651
$3.66
8GB micro SD @ $2.28/per
http://www.gearbest.com/memory-cards/pp_337825.html
micro sd usb reader. 0.38/per
http://www.gearbest.com/memory-cards/pp_261098.html