I buy a lot of stuff from local online auction sites and there have been several auction lots for gallons of paint. I'd like to buy these but I don't know if I'd be able to get it tinted anywhere. Does anyone know if that is something I can do? Like, can I bring a gallon of paint to a Home Depot and say, I want this color? Do I actually have to buy the paint from that store? Paint is just so expensive, but I'd also really like to redecorate my house in the colors I want.