I picked up a Thermadyne mig this summer for $500, 135A 120v. Runs flux core or gas, I've just used flux so far and the thing has paid for itself several times over with the work I did on the 240 and the various other things I've found excuses to use it on. Comparable to the Hobart/Lincoln machines but a few hundred less. And it works alright on 50ft of 14ga extension cord, though I did spring for a 100ft 12ga cord for it. Next time you're in Dartmouth check in at Schooner Industrial on Ilsley - they bought out Welding Warehouse's stock a while back and they're selling some gear way below retail. The guy to ask for is Derek but he's usually on the road, if you want his cell number email me. The Decas at Princess Auto do seem to be pretty good and very inexpensive, I know a few guys who've had them for a couple years and no problems yet - my only worry is parts availability 5-10 years down the road with those.
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Chris, Dartmouth NS Canada 70 M-B 280SE, 83 245DL, 84 244 turbo, 90 780 turbo, 92 VW Golf, 90 740 Rex/Regina