Costco does usually have good prices on appliances, especially during their sales. Also like the "idea" of an extended 2 year warranty as most modern appliances have gone to only 1 year at most (thou realizing a warranty is only good if it is lived up to, and luckily haven't had to rely on it!). But, as for installation, I have run into the same issue on two appliances purchased in the last year, a washer/dryer and a stove. Costco has included delivery, installation and haul away in the pricing, but on both the dryer and stove (which were gas), the installer on each arrived with the incorrect size connection line. Both times they indicated they'd have to return with the correct line and both times they never came back. In each case I had to purchase the line and install myself. I reported to Costco, but I believe they are merely the middleman between the appliance manufacturer (who they send the order to) and the manufacturer's installation contractor.
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