Amazon offers its Amazon Prime members the Lexar JumpDrive FireFly 16GB USB 2.0 Flash Drive in Red, model no. LJDFF16GASBNA, for $19.99 with free shipping. (Non-members can bag free shipping on orders over $25; otherwise, shipping adds $4.99.) That's $1.25 per GB and the lowest total price we could find by $2.

Amazon Prime membership is $79 per year; however, Prime is free for college students for one year, and free for parents and caregivers for three months.