I just got a load of .50cal and .45cal ACP, after 2 week wait.
Here’s some places, which have product and are shipping:
http://www.ableammo.com/
http://www.sgammo.com/catalog
http://www.cheaperthandirt.com/
http://www.midwayusa.com/
http://www.ammunitiontogo.com/
http://palmettostatearmory.com/index.php/
http://www.doubletapammo.com/php/catalog/index.php
http://www.kygunco.com/
http://www.luckygunner.com/
http://www.ammoman.com/
http://www.corbon.com/
http://www.federalpremium.com/default.aspx
http://www.natchezss.com/
http://www.shopalexanderarms.com/.50_Beowulf-Ammunition.html
Good.
I see “out of stock” on most websites.