I contacted a contractor today to work in my bathroom. He suggested that I not go out and buy tub, surround, toliet, but they would be purchasing it through a plumbing supply company. Is this standard practice? I would have to wait 2 months for these items, yet I can go to Lowes and get it in 10 days. He said even if I buy, lets say Kohler products, they can't guarantee them. I've done my research and know what's good and bad products. Are they just looking to up the bill? Thanks in advance!