Prices for loose carts have gone up here too. Everything went up as small market and importing costs more (also more difficult like for Japanese stuff).
Although it's still possible to get some cheap stuff; imported US NES carts are an example of this. Also, as I mentioned already, you can snap up a bargain if you find it quickly before it's gone.
I got an Italian Metal Gear NES loose cart cheap as the seller listed it as untested and also listed it as NTSC. The Italian cart is the same as the UK cart (both have English and are PAL A).
Atari loose carts have gone up, I got a small lot recently including some double enders but I got onto that quickly.