I thought he's just looking for paint detail stuff and interior trim and cleaning stuff....not Depos and HIDs
I'm still with www.paintscratch.com
if he just needs touch up paint....and bavauto is good but when I first bought my car I was looking for trim stuff for my interior I didn't find them to have a complete list of much....and Bavauto is not that cheap as people would lead you to think....they have sale items that you'll get for a bargin but the normal prices are just a close if not the same as dealership prices. www.realoem.com
is a more technical, thorough website for almost every possible part you could buy for you E36. I mean tiny trim stuff from door speaker trims to a new 12V lighter cap, to dash panel buttons and dials...which is the basic stuff that wears quickly on these older E36s.
Ebay is risky yes...but as with all risk the payoffs can be extremely great. I bought a set brand new OEM Rondell Y spoke 16 inch rims w/ 95% new Michelin MXM tires mounted on them for $400 last summer when I bought my car from ebay. for a great example
. Even though shipping was like $130 it was still a steal.
But still for simple trim parts, replacement buttons and dials you wont pay out the ass at the dealership...and you could definately get stuff on ebay that you need for 1/4 the price. Also think about it the car is used already so buying used parts in good condition is okay instead of wasting money on new parts for a used.
For mechanical upgrades I highly recommend that you get the BMW Dealership Diagnosis. Its only $500 or less. E36 cars are tricky and you can't always tell whats wrong by simply popping the hood. Especially if you bought a 14 yr old car that has no service records. Get the dealership diagnosis, and then you'll know what you need to DIY. For mechanical stuff you want to fix check the faq sections from there...and most likely 90% of the problems or maintainence you could do yourself if you're handy with cars.
Also when posting on the forums ask specifically what you want to upgrade or fix (trim, engine parts) and maybe we could direct you to what you need.