It depends what you're looking for. If you want to chuck naff ebay parts on your car you might save a few bob but getting the likes of Lemforder suspension parts for pennies isn't a bad thing for example. Oil is normally well priced, Mann filters not a bad price if you need to order same time etc. I get trade anyway but not a lot less than retail with discount codes for bigger parts. Sometimes I just buy retail using discount codes than via work for the 2 quid difference to save on paperwork and selling stuff to myself
As for car stuff, visited the garage today as 3/4 people have driven my car and can't find anything wrong... so I took the director out and low and behold the steering started snatching left again and it started feeling loose at the front. No one can see anything untoward. I still think CV joint or something is dying once it's got warm on a straight road for a few miles. I want it done asap for £0 so I can get rid of the damn thing. I've done more miles in a 1.2 Punto 8v than I have my own car in the last 2 months (out of 4 months owning it!!).