A4C via eBay offers the refurbished SanDisk 2GB Memory Stick Pro Duo Memory Card, model no. SDMSPD-2048-A11, for $4.49 with free shipping. That's tied with last month's mention mention of a refurb as the lowest total price we've seen. (It's $7 under the best price for a new one.)
Note: No warranty information provided.