I currently store my dice in pairs pushed into styrafoam, I also have a lot of singles. I am looking to get diecut foam to store the pairs. I want to use polyethalene foam as it is considered archive safe. It suposedly will not degrade and damage the dice. Byproducts of most foam ruber degredation will corrode your dice long term. I have several pairs of dice with this type of foam damage. If you have extra dice I am always looking for trades. Take a look at my dice page
www.casinodice.net
I have my extra dice for trade listed as well as a few chips.