Anyone know a reputable place to buy a rebuilt ECM from?

Thank you for the insight! I was wondering if the PO602 & PO613 codes could be caused by anything other than a bad module. Do I need to take it to the dealer to have the PCM reset? Is that the same as having it reflashed? The dealer said they won't do anything until I pay them $110 to re-pull the codes (since I had a local auto shop pull them.) And then $110/hr to trace wires, check sensors, etc... to try and diagnose it. They also said they charge $125 to re-flash one. >>> One more thing... My truck currently runs. It just feels like it's in N when I start and when I accelerate, it doesn't have the usual get-up-and-go and kind of loses power. It also lurches, gets terrible gas mileage, etc... I haven't driven it much, since the symptoms started. Thankfully, we have another rig so I am not forced to immediately take it to the dealer while I explore alternate, possible options! What I don't understand is when I disconnect the battery to reset the codes, it will drive PERFECT for a few blocks, like it's brand new! Within a short time, it will lurch and the MIL comes back on and all the above symptoms come back. If the TCM is bad, is this possible???