All4Cellular offers the SanDisk M2 4GB Memory Stick Micro for Sony Ericsson for $4.95. Coupon code "A4C6A5" cuts it to $4.70. With $2 for shipping, that's $1.68/GB and the lowest total price we could find by $6, aside from the price below. (It was a buck less last month, since expired.) Deal ends October 31.