If you've got $$ to burn

My brother, an avid ebay surfer, sent this:

A bottle of beer that sold earlier this week for $503,300.

Check it out here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=016&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=260145824374&rd=1

How many 6ers of PBR is that?