Never seen/heard of even one. There are tons of Polish Flexis on Ebay, tho, with practically any artist you want, including the BBs...
The Polish bootleg cassettes from the late 80ies and early 90ies were a real treat as well. And from every artist one could imagine they would make them. Especially the passing of a musical hero, could cause huge series of reissues. I remember that when for example Freddy Mercury died, literally every album, ans solo stuff was available. But the same would happen when Zappa died. And these were made by several small businesses. Quality differed drastically from very good, to very very bad. If it would make it easier to fit the music on the tape, they would make a different tracklist, or simply leave a song or two out (for example: no clue why, but I bought the "12 inches of Snow" album by Snow, but as there wasn't enough space on the cassette, they left one track off and called it "11 inches of Snow").
I think I have 4 different "pressings" of the Still Cruisin album for example.
I bought lots of those while on vacation in Poland where we went for many years. Very cheap for western standards (as CD's were too expensive for the average buyer at the time). But very illegal. Somewhere during the 90ies I suspect the cassette market slowly ended there as well (or selling them became too risky), and one could only get the more expensice tapes, or the by then more common CD.