I thought at one time we were compiling a list of places to buy parts from in a thread but I can't find it, can anyone confirm or deny this? There are a lot of things to do to an e36, what do you want to do.
A lot of people will do chips/reprograms, intake, exhaust, suspension, short shift, wheels/tires, brake pad/fluid upgrade, big brake kid. there are also more serious upgrades out there depending on the cash you want to drop and what you want to get done. give us some ideas and im sure someone can give you some good suggestions.