I picked mine up from a pawn shop (NIB) was $300, plus my bottle (150 of 25/75 for $80) and my mask was $75 for the auto-dark. The machine is a 220ampThermal Arc FP165 and can handle up to 5/16 SS with .035 using 98%Ar 2%CO2 and SS ER 308L type wire. I want an aluminum welder and plasma cutter
so all in all was a score on the setup I have, shop around. Having the skill to weld is always valuable, even if just for a hobby. Lol I made my mom a stand for windchimes that she wanted, normally a $200 piece at Lowes cost me $9 to make
Theres a load of supporting things you'll want along with a mig
Beginners should get leathers until you learn to enjoy the occasional sting- I've got around $120 in my leathers for the sleeves and apron and gloves
Grinder and wheels
Torche and a few bits. I have 2 bits for cutting and a rosebud for warming metal.
A couple of magnets will make holding pieces together easier, for building boxes and other plate type assemblies
Don't go cheap on your mask.. eye balls are always more expensive.
You don't have to get the best welder on the block, but a super cheap one will just pi$$ you off trying to dial it in