Changing the diff side seal in the car can be done but mucho easier with the diff removed. I'd make real real sure its the flange seal and not a loose axle (six attaching bolts) allowing CV grease to sling out.
If it the axle they're pretty cheap new thru Rockauto @ $60 per.
Typically the rule of thumb is rag-wrench a seep and fix a leak. Both are subjective though.
Plenty of youtube videos on the subject. Search for E36 differential seals.
ECS tuning and Turnermotorsports sell complete diffs and seal kits.
Thanks for the info. My thoughts on the seep are like yours ... it'll take a lot more than a drip or two over a couple of weeks to warrant me pulling the differential.
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