There are many alternates to eBay.
First, It's surprising what you can get for free if you tell your friends you're collecting old videos games as a hobby (not for profiting). I've ended up with a TurboGfx-16, a Genesis, an extra, yellowed SNES (sorry can't sell it - it was a donation), a Colecovision (for parts), and a bunch of carts. A lot of people see it as old junk and don't want to go through the hassle of selling it and would rather give it to someone who'd appreciate it. Throw up a FB post or spead the word somehow.
Secondly, check out game collectors forums (RFGeneration, Racketboy, etc.) and see the for sale threads. You'll have to become a member and post a bit, but often enough, you'll get carts and consoles for better prices than eBay.
Third, garage sales, pawn shops, thrift stores, and flea markets are a gold mine if you've got the time and energy to dig around a bit. Of course, that requires much more dedication and, ultimately, you may just be better off buying one off eBay if you just want the SNES and don't care to be bothered. But if you're into the thrill of the hunt, then scouting out garage sales, etc. and getting some $25 cart for $2 is the best part of collecting.

(And yes, the SNES is one of the best consoles if not THE best console. So many great games and the zenith of 16-bit graphics. Love it.)