BlueProton via Amazon offers Amazon Prime members the OEM SanDisk 8GB M2 Memory Stick Micro Flash Card, model no. SDMSM2-008G-K, for $7.97 with free shipping. (Non-members pay $5.03, or spend over $25 to qualify for free shipping; Komputerbay via Amazon has it for the same price.) That's $1.00/GB and the lowest total price we could find by $22.

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