You could try to find someone parting out a sedan or perhaps even a ti. I doubt aftermarket fenders are going to fit as well as Genuine BMW fenders, but if new ones are out of your budget, then I'd opt for used ones. One thing to make special note of is to make sure you get fenders with the correct sidemarker cutout for your vehicle. 09/96 and later models have cutouts for the newer style sidemarker lights. If you need a left fender and want to try an aftermarket one, ecstuning has them on clearance for 27 bucks:
http://www.ecstuning.com/BMW-E36-318...nce/ES2500771/