I am assuming your referring to the EZ-Flash 3in1.
EZ-Flash is the flashcart maker's name and brand. As to the fact that there are a few different models, it is best you specify what exact device you are talking about. Nobody here is a mindreader.
The 3in1 been around for well over a decade and had a $20 price point for the majority of that time. It is only recently that it is no longer being manufactured, that the price has gone up to $30 or higher and the sellers of the 3in1 have been dwindling down. If you consider 20-30 bucks "pricey", you might as well sell off your stuff and move on to something else like a 3DS.
If you want to buy it from another user on this site, your going to have to meet the requirements for the trading section.