I have a Super Joy 3 that has a 60 pin fami-slot, but the A and B buttons are reversed.
My Yobo NES clone is really cheaply built; the controllers are crappy. The controller ports are compatible with the original NES, but they are slightly off sized and changing controllers requires some effort. The cart slot is very tight so I just leave an old copy of SMB3 in it. The Satellite, the Fourscrore, and the PowerPak are all incompatible though. All of those cheap NES-on-a-chip (NOAC) fami/nes-clones won't support the PowerPack for that matter. There are some graphical and sound glitches present, and I don't think that all MMCs are suported.
The best bang for you buck in my opinion is a broken front loader with and diy overhaul and a conversion cart.
Cheapest way to get a famicom cart on screen is a flea market Super Joy.