Peterson Paint Supply

So here's the deal with Peterson Paint Supply: We got screwed. Let me elaborate. We went in a few days earlier (7/22/2011) and bought a gallon of paint that our landlord told us we have to use. He mentioned he could pick it up for us, but we wanted to be nice and said we will pick it up ourselves. He did tell us to mention his name so the price was right. So off we went. We got to Peterson Paint Supply on 7/22/2011 and asked for the paint our landlord told us to use, and mentioned his name as well. We got our gallon of paint.. which cost $38.00!!! Shocked, we purchased it and went home. Three days later we needed to go back to purchase more paint. This time an older gentleman(possibly the owner) was at the desk when we asked for the exact same gallon of paint (mentioning the landlord's name) as the first time. He sold it to use for $23.00!!! We told him we bought the first gallon for $38.00, but no refund was issued. He actually had the nerve to say he did us a favor selling us the second gallon at the discounted price.. like that even makes sense... don't buy from Peterson Paint Supply!!!PS. They are not open on weekends. (Aren't weekends when people paint??)