Yeah as others have said we are in a nice little retro boom right now and I don't imagine it is going to pass any time soon. Luck and serious shoe leather or petrol and effort are your only real chances of getting in cheap these days. You can try a few things to help (ever see someone's mum call it a sega nintendo? Guess what they might try listing it on ebay as, that is perhaps a bit too obvious and broken but play the players and all that) but you up against people with the time, money and knowhow already.
If emulators do not do it for you (and you can do things like get a CRT to output them to, emulate the CRT itself --
http://bogost.com/games/a_television_simulator/ , get nice controller input methods...)
If you wait a few years we are probably going to start to see true console clones become more common*. Right now the non official world it is a mix of hardware emulators and crap clones/90% of the way there clones** but chip fab prices are coming down, FPGAs are getting faster for when that is not enough and the skills are filtering into the regions of mere mortals.
*you have things like
https://github.com/trun/fpgaboy and people are decapping old devices to get full chip layouts and behaviours sorted.
**and of course that last 10% is enough to sink it, see also the famiclones and their failings.