Congratulations! I love my AR's and frequently take one to bed with me... the wife objects, of course, because it doesn't warm her cold feet when it is between us... so I usually stand it against the wall next to my side of the bed. If I have to get up (bathroom), I usually turn on the light to look at for a few seconds! (A friend of mine makes his wife and kid kiss his AR every night!)
www.cheaperthandirt.com has a pretty good price right now on 20rd mags ($12.95) at this link:
http://www.cheaperthandirt.com/ctd/product.asp?sku=MAG%2D062&mscssid=MVXFE44CVQ4P8GKQ9FLMERN45T8V2T6A
And Delta Force has 30rd Thermold mags for $34.95 in their catalog. (1-870-862-4984).
BTW... one of my AR's is a Bushmaster and it's a really fine gun. Take time to learn how to disassemble the bolt carrier and put it back together properly. Bushmaster manuals are great too, and provide detailed info on disassembly, cleaning/lubing and reassembling. And pay close attention to the statement in the manual about properly replacing the cam pin... the manual says "if the cam pin isn't installed properly, the gun will fire but will explode." Always scares the shit out of me when I read that. neadless to say, I check to make sure it is installed properly several times before inserting the bolt group back in the receiver. Actually I am not sure the cam pin CAN be installed improperly, unless you leave it out.
Anyway... Go have fun with it!!!... [:D]
ARnSC