I seen things like these:
But you should know that these are very bad for overall system disk; you'll have freezes and such; sometimes longer than 1 second. This is because small writes require an intelligent controller, or they will take a very long time (read-erase-program cycles).
So if you're looking for performance; the first thing you should look at is the controller. If you just want a read-only tiny flash disk for specific purposes, these will do fine. Also note that the wear leveling techniques are very basic, and the write amplification of these SSDs is very high (which is bad).