I’ve already got an Everdrive. I like making single game carts. I was unaware of the raphnet product but that’s considerably more expensive than original carts.
It doesn't handle all the features of the standard mapper so not compatible with all games, but it's designed to be cheap to manufacture. Unfortunately I don't think anyone is selling these so you'll need to take the files to a PCBA house (or get bare PCBs manufactured and do assembly yourself)