harbor frieght cutoof wheel-$6-10 on sale, awesome. i have 4 or 5. never had an issue with them. boss has one thats 10 yrs old, just starting to slow down.
harbor frieght air saw, $20 on sale. got one a long time ago that works great after alittle lube and adjust, had a budddy who bought one and returned 4 times to get one that worked, barely, after way too much time adjusting lubing and grinding to fit.
recently got a long reach right angle cutoff tool (wheel) from matco, pricey, but awesome. great for those hard to reach bolts, and comfy for long sheet metal cuts. HF has one, never had one outta the store though, about $50-60.