I recently ordered about $350 worth of parts from True North Arms. The speed of service is impressive - less than a week after I placed the order I had the parts in my hands.
They even combined two orders that I made AND refunded the shipping on the second order!! (I had a brain fart and forgot to order a couple things )
All parts I ordered were well packaged and shipped in one box - and their standard shipping cost is $7.50.
I will definitely be doing business with them again, and recommend them to anyone in need of AR parts (they've got some SKS stuff too).