I saw a link to this while surfing for solutions to something different.
The VLSI Solution VS23S010 is an easy to use one megabit static RAM device. The memory can be accessed via a standard SPI compatible serial bus (1, 2 and 4-bit modes), or via an 8080-type 8-bit parallel bus similar to nand flash devices. One of the main applications for the VS23S010 is microcontroller RAM extension. Internet streaming applications, which are becoming increasingly popular, will benefit from the large buffer memory provided by VS23S010. For an example of usage, please see VLSI's internet streaming presentation at http://www.vlsi.fi/fileadmin/presentations/vlsi/Internet_streaming.pdf .
That's a pretty big bucket to not have the occasional holdups that SD will get.
They don't have them in the store and the request engineering samples gets 404'd. But the target quantity price is .99 Euros.