2001 Chevy Suburban Fuel Pump/ Price?

Dear 2carpros,

I have just been told by my local auto-clinic that a new fuel pump for my Chevrolet Suburban, 2001, 1500, 115000 mi, is going to run, for just the part, $550.00.

I've seen at some big online car-part sales-places that the pump only costs $250.00-$300.00. I also asked a guy at a Midas and a gas-station how much it should run. The Midas guy said $560.00, the gas station guy said $350.00, and another person at the Auto-Zone store showed me the gas-pump in their inventory. For $250.00.

When I asked the mechanic at the auto-clinic how much it would cost, he told me the price, I told him it shouldn't cost that much, he said it does, I said again it doesn't, and he said: "Listen, I've been doing this for 40 years, so if you f***ing wanna come in here and replace it yourself, be my guest." I hung up because I was in front of my girlfriend and pissed, if I hadn't I would have fought fire with fire.

So, question is, even though it's obvious to me, am I being overcharged?