Watch on Facebook marketplace or Craigslist for good used brand name unit. Bonus if they come with accessories such as cart, tank, regulator, wire, etc which can save good bit of coin.
My welder is an older HTP brand, model MAXIMIG. Built like a tank, weight at least 200lbs, take two guys to lift it. If I remember correctly I paid like $700 for it OTD, full gas tank, regulator, nozzles, contact tips, some 10lb spools of wire, etc. circa 2009 directly from HTP company owner/president.
Go as big as you can! Avoid 120v MIG, they’re useless except for sheet metal welding. Dual 120v/240v machines OK and can come in handy sometime though!