It looks like Steyr started making the AUG A3 semi available for american sale earlier this year.
You may want to check out Steyr's dealer locator at Steyr Mannlicher US:*Dealers
Looks like a couple dealers in Norristown, may be closest for you. Dont know about availability, you'll have to check. Looks like prices from what I've googled in the $1700-2000 range.
Hope this helps a little. Thanks for your service & welcome to the forum. Stop by the introductions section and tell us a little about yourself!