I thought I ought to pass along this little tidbit of info I picked up along the way...
If you're ordering something from Numrich Arms you can save yourself some dough. Call them up on the phone (during business hours) and listen to the message. They'll offer you a code to use for free shipping if you order online. I get the code and them place the order through the website. I haven't paid shipping for a long time.
Usually, I only order some small part that shows up USPS in an envolope with a 39 cent stamp on it. They've charged me that flat rate dozens of times so I don't feel bad about getting the free shipping...
Thought you might could use this info on your next order...