25th(!) trip to Prague!? Damn, and I haven't even made it to Europe yet.
So it sounds like there are 2-3 stores in each of Prague and Moskva (fotofishka, kamepa/kamera, ekta-f) to visit, plus the mall in Beijing.
Does Wukesong have much in the way of interesting old gear? In my googling for it, it sounded like mostly DSLRs and cheap chinese accessories.