Hi
That would be interesting, but I haven't seen anything around here (Oklahoma) that is in that era. I haven't checked the net, but from what I saw AEF Supply had given up a little a couple of years ago.
Later
There was recently an event in Parsons, KS, and there's a Belleau Wood event in TX next month. Probably not super close to you, but there are events going on in the region. If you're on Facebook, check out the Midwest Great War Association.
As for supply sources, What Price Glory and Man the Line seem to be the two main players in town. WPG just released a new, affordable M1912 US uniform that seems pretty good.
On topic: There are a couple of Facebook pages for Spanish American War reenacting, but not many, and their activity seems pretty limited. Not sure how many active "units" there are for that period.