I don't belong to any reenactment groups and certainly couldn't afford to join one like the following - Uniform, Camo., weaponry, all very expensive. Thought about joing a Civil War reenactment group a time or two but never did.
I have always enjoyed looking at the photo galleries of WW2 reenactor groups as they provide a multitude of resource materiel in the way of correct uniform, cammo. color, accoutrements, etc. - these guys are real sticklers for accuracy.
Here's a group I know a little about though I have no affiliation. Their creator was a former 5th SS Wiking Grenadier, I always thought that was fascinating...still fighting the war (in a manner of speaking) until he died in 2003.
Trying to get this sub-forum rolling,
razorboy
Kampfgruppe Haase: Unit Roster