Are there homebrews relased on actual carts, that you can normally buy? I ask it, cause i like having homebrews like real games (on cart), not like pirates (on PC, playing on emu), so are there aby relased as this?

No, not yet. The big problem is in the cartridge connector, which is non-standard and (I think) is covered by patents in some countries.

Ok. I asked, cause i think someone may place his game on an existing cart.

Why not just buy a whole bunch of copies of Mario’s Tennis and do it that way? I had a spare Mario’s Tennis and had someone put my GoSub game on it for me.

Of this is for me, i don’t know hos. But if it’s for homebrewers, i don’t know why they don’t do that.