I got one recently from Cabelas:
http://www.cabelas.com/product/shooting/gun-storage/gun-cases|/pc/104792580/c/104730480/sc/104368680/cabela-s-ar-rifle-case/2206396.uts?destination=%2Fcatalog%2Fbrowse%2Fgun-cases%2F_%2FN-1100211%2FNs-CATEGORY_SEQ_104368680
I really like it. Heavily padded, and the side pockets will hold either AR-15 mags, or LR-308 mags. My M1A Scout, and magazines fit in it well, too.
Squeeze