I have the first Sanchez LP, simply titled Poncho. It's excellent. (Several of the tunes are available on YT, if you'd like to sample them.) I've been keeping an eye out for the second LP, Straight Ahead (Pa'lante). But it fetches silly prices from re-sellers, and I don't want it that much.
If you're interested in more of Fischer's work in a Latin jazz vein, you should definitely check out Cal Tjader's Guarabe -- assuming you haven't already heard it:
I think Guarabe is a wonderful record, one of Tjader's finest. It's just as good as -- maybe even better than -- Fischer's "Salsa Picante" recordings for MPS. (As ever, YMMV!)
FYI: If you're looking to buy it in digital format, Guarabe has been reissued on a Fantasy CD called Here and There.