Miller makes a few MIG welders that will run on 110V input power:
Miller 135 - their cheapest MIG welder http://www.millerwelds.com/products/mig/millermatic_135/
Miller DVI (Dual Voltage Input) - runs on both 110V and 220V power. A nice choice to be able to weld immediatel but not have to replace your welder if you ever get 220 installed. http://www.millerwelds.com/products/mig/millermatic_dvi/
Miller Passport - a portable MIG welder that can also run on both 110V and 220V http://www.millerwelds.com/products/mig/millermatic_passport/
I haven't looked much into them, but I'm sure Lincoln and other brands also sell 110V welders. I know they sell cheap ones at Lowe's/HomeDepot/etc that run on 110V. As
[email protected]. said though, you need to check into the limitations that 110V welders have on them, namely output capacity and duty cycle. Check out this page for a comparison of Miller MIG welders: http://www.millerwelds.com/products/mig/allinone_products.html
Hope that helps! Do your research before buying one!