Welcome to MFK!!!
Wow!! Post these questions as different threads so you can get the most coverage.
Pimas are legal. The CITES II classification simply means that proper permits are required for exporting that species. Since pimas are now farmed commercially, these farms routinely offer pimas to the world pet trade.
Check with Wes (of Rarefish) and our other sponsors for bagarius cats.
Redtail cats are not hard to find lately. You must be looking in the wrong places.
Veiltail oscars? Try our sponsors.
B. filamentosum are occassionally available. Again, check our sponsors. A few of them have awesome connections with south american collectors/exporters
You must have some huge setups to be looking for pimas, RTCs, and B. filamentosums in the same thread.