Today I was surprised by finding that some of Notebooks (and super-computers) has SPUs that are used in PlayStation3. Unfortunately I cannot buy any of them at this time of writing and I don't know why they don't sell them anymore.
Little more details are here:
Those notebooks has 4 of SPUs whereas PlayStations3 has 8. So it is little simplified and smaller version of it. I also heard that it comes with some kind of manuals for SPU programmers, which is very interesting.
I have also found that F10 had some defects on chips, so probably G50 and G55 should be available still...