Unless there’s something ridiculously rare in that set, 200-300 is a bit much. (I’m assuming you’re American or Canadian here) The Super Famicom console itself only goes for $30-50 if you aren’t looking for a pristine/boxed system.
SNES & N64 stuff is in a massive pricing bubble right now, and the release of the SNES Classic probably jacked up that bundle’s price even further. Goodwill and secondhand/consignment shops are notorious for that kind of thing, and they’re a massive pain to haggle with, if you can haggle with them at all. Without a picture of the games, just going off of the other bundles I’ve seen over the years at that price range, I’d be willing to bet half of those carts are sports or mahjongg games (and it’s really hard to tell if something is a mahjongg game at a glance).
What you could do if they still have it is snap some pictures of the games & check them out on eBay, factor in shipping for everything, and then you’d have a rough idea of what to do.
Here’s something you can take advantage of with the SFC, regardless of what you decide to do: Compared to the SNES, SFC games are cheaper in general. The majority of non-Nintendo releases should be priced in the $5-10 range if you’re dealing with someone who isn’t trying to ride the SNES nostalgia gravy train. That DBZ game you mentioned is like $6 on eBay for a loose copy or $20 for a boxed copy. So if you get an SFC from someone on eBay, Craigslist, or a shop that actually prices stuff fairly, you’ll come out ahead!