Feels a little high but who can keep up with the cost of things like that, there's no such thing as "no interest" financing so it's really baked into the price...

Only way to know for sure is another bid, I personally like to get labor-only bids with a materials list, then price the materials myself from a few places... Lowes/HD really like to subsidize loans on materials with their own CC's... and if the crew ever takes off with money you still got your materials.