I've also used the Atmel Dataflash (AT45DB321C (32MB)). Worked well with Shiftin/Shiftout. Also worked with the Hardware SPI, just a little harder to setup.
The hardest part is finding a supplier with some in stock. I think I got some obsolete SOIC parts from Arrow, but it's been a while. Digi-key lists all of there compenents as Non-Stock, but you might give them a call.
SteveB
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