Just for s & g's, I took a look on eBay at top-loading NES.

$110 + for one with 2 controllers & SMB / Duck Hunt... and that's a live auction, with bids!

I got a top loader off free cycle a couple of years ago with 2 controllers, a zapper, SMB / Duckhunt, SMB2, and SMB3...
If it wasn't my only NES, I'd throw it up there. Wow.