1.50$ for an entire pack of USB sticks? Where did you find such an offer? Because according to amazon, the cheapest they have are a pack of 10 USB sticks, 1GB, for 39$:

http://www.amazon.com/dp/B00E3MII96/

Not exactly cheap, if you ask me. Not exactly super-expensive either, of course, but definitely not cheap. And I think the reasons the price for floppy disks doesn't seem to go down is because only certain people still use floppy disks, i.e., the need for floppy disks is nearly non-existant.