Lee with respect, you have forgotten about a few things or not understood.
I quoted you to fit on your doorstep, you're in wales for a start, it will cost me about £80-£100 in fuel alone without even considering the time to drive there & back which is basically half a day, cost of the bridge, so take that of the price, then allow for the fact it was to install where you wanted, within reason that is (Jersey isn't included
my units are not stolen, they come from a reputable source I've always used & they always work & new condition.
Yes ebay is cheaper, but lets be frank, that magical 2yr warranty the offer is nothing after 45 days of paypal claim period, they're not interested, as I have had to fix problems for multiple people who have bought from ebay.
I warranty my work & the parts I fit & the Police have no way of checking any such units & the ebay guy is full of shxt, the police wouldn't check them at all, so I would steer clear of this person.
In reality, prices I charge IMHO & others have told me are very fair considering the cost of parts from audi alone, you pay for what you get, I take pride in the installs I do & make sure it is done to the letter, to date I don't recall a client whose been unhappy with the work.
I'm at a loss tbh how you summise, based on your pricing, that £150 including fuel, bridge, food, travel etc is expensive, its beyond me.
I know other companies charging a lot more than me aswell & they don't do the jobs properly.