Take a look at http://www.comitatus.net
We performed to over 20,000 people this year. The era may be less popular than the earlier centuries for reenactors, but the general public love our displays, and we help equip our members with group equipment. It's not all as expensive as you might think. If you can make it yourself!
There is lots of research into the Late Roman era, which allows us to make great reconstructions.
You may enjoy some of the vast research on our website:
http://comitatus.net/reconstructiongallery.html
http://comitatus.net/research.html
http://comitatus.net/photos.html
Hope that helps!