Go onto TaoBao; search for mechanical keyboards, looking only at new items, and sort by price. Start at a reasonable number, then go down. Go down until you get to the cheap stuff in the $30-$40 range with older-generation Kailhs and other "MX-Compatible" switches, and then keep going past those things down into the $20-$30 range. Now, at that level, most of the keyboards will be rubber domes that call themselves mechanical-like, or say they have a mechanical handfeel, or that are just falsely marketed as mechanical. Others will be rubber domes with 8 mechanical switches (usually on WASD and the arrow keys). But...down there, in the realm of companies too cheap even to use the lowest of Kailh switches, you'll also find a couple of keyboards-- and remember, we're talking new only, not used-- that are fully mechanical, using ALPS-style switches of unknown provenance, sporting names like "MG Flame" or "Flagk Iori".
Try one of those.