Cost of parts

Not just the cost but also sourcing the correct part and getting the suppliers of such to see through the money part of it. When actually supplying the correct part is the most important part of supplying the parts in the first place. From my thread of the Mondeo I was asked to carrying out an mot test. The IPC always advised while in my care that the nearside front headlamp had a problem. I never thought much about it until the leveling device operation failed the test. I rang the local lighting factors and asked them for a price on a new lamp, the price came back £282. I was told it is because there is a swivel motor built into the lamp, which I assume must be something to do with the curb lighting arrangement? 

I decided to see what other suppliers were charging (big mistake?) I got an online price of £90. I sent a message to the seller of the headlamp asking if the lamp being sold had these motors built in. The supplier said he checked the lamp against my registration and the lamp was compatible. Upon arrival I checked the lamp and found that no provisions for motors were built into the lamp unit, hence the lamp was a different technical specification. From about last Friday I've been repeatedly emailing the supplier and getting nowhere. I contacted the online site administrator and they have taken two days to get back to me, which has not been of any real help. I contacted paypal and advised them of my concerns and said that now I contacted paypal the seller has now issued a return address for me to send the lamp back to, but my concern is that I asked the supplier to check and ensure that the lamp was the correct one before he dispatched it, and he acknowledged he had checked it and was okay, however, I don't feel it is my responsibility to pay the return postage on an incorrectly supplied item. 

Maybe the cost of parts is not the be all and end all after all if so much of a nightmare is going to happen buying online!