In the market of buying extra memory for your PSP? In need extra space for homebrew applications and PSN downloads? Look no further! As part of their annual Black Friday sale, Office Depot will be selling a SanDisk brand 4GB Memory Stick Pro Duo priced at a mere $15 dollars on November 28. This is by far the cheapest price we’ve found on a 4GB card yet.

Office Depot Black Friday Ad [BF.info]

Read more: Mega Deal: SanDisk 4GB Memory Stick For $30, Storage Heaven: 16GB Memory Stick PRO Duo Coming In March, Wal-Mart Offering $100 Gift Card With PS3 Purchase, PSPComic v1.0, iR Shell 4.8