Nintendo DS lite is cheap and good. You can get them from Japan off of eBay and get colors that are Japan exclusive. Sometimes you can buy them as ‘not working’ and it just needs a battery or just the buttons need to be cleaned. Just don’t buy one that needs a new top screen as they’re hard to replace and cost too much compared to just buying a different one. You can get flash carts for them for cheap and load every game onto an SD card.