there seems to be a lot available on avito. i see a lot of other logitech mice, razer mice, steelseries, zowie..
anyway, if you like your G400s, it's available for 700rub, pretty cheap for a good mouse.
the G5 and G700 are also available, but since they're laser mice i just wouldn't recommend them for a gamer. not that they're bad, but just inferior. however, if you insist on the G5, then that one's available for very cheap (300rub) - nice price! the G700 would be more expensive and i don't really think it's worth it..
another option is to try and pinpoint the issue of your current G400s so you can fix it. because if you buy a used product, maybe the same thing will happen (or has already happened). but of course that would mean opening up the mouse and possibly ordering new parts..
that said, i also see cheap deathadders. 1200rub for the 3.5g and 1300rub for the 2013 edition. they're good options as well.
there's also a zowie EC1-A for 1500rub and a zowie EC2-A for 1500rub - also good mice..
i could probably go on and on since there seems to be a ton available. i do recommend going for an optical LED one and not a laser one. a new shape is always a gamble, so maybe that G400s should be good?