I met in almost each disco/music bar some girls I knew from night clubs or escort agencies but they were having fun on a free night not working...
Unfortunatelly there is no real pick-up bar like Chesterfield/Night Flight in Russia or River Palace in Ukraine but there are often a few (working) girls in Solidni Nejistota - some night only a couple of girls, some night 4, 5 or 6 girls. No idea about the rates.
In the past I remember some freelancers in Bugsy“s bar, in Arena disco, in Music Park disco (now closed), in U Zlateho Stromu disco (they "cleaned-up" the place a few years ago)...