I've been looking for a good source of foam recently in light of being able to participate once again in my all time favorite activity. I've stumbled upon this polyethylene foam from foamforyou.com and wasn't sure about it. Say's it's 2.3# per cubic foot. Which should in turn be usable for bel standards for weapons and shields correct? Here's the link so that you all can take a look, because if it is...I'd personally order the roll of 90ft x 55" and call it a day/year lol.
http://www.foamforyou.com/polyethylene_foam.htm