I need a safety net for shipping my frozen fish, although the boxes are well insulated. As we all know shipping is getting more and more expensive and not always reliable. Insulation will only take you so far. There is no dry ice supplier near me, and I see the item below may be the ticket for filling in a void around the fish with "dry ice snow" or " dry ice flakes." Wouldn't be much room for the dry ice but I don't think there would have to be much at -190 F. I don't have any problems getting access to liquid C02 to attach to the below machine. http://www.ebay.com/itm/Bel-Art-Scienceware-388860002-European-Model-Frigimat-Junior-Dry-Ice-Maker-New-/121162755280?pt=LH_DefaultDomain_0&hash=item1c35dcecd0 Could the dry ice cause any issues with the frozen fish or vacuum seal they are in? I realize dry ice is heavier than H20 ice but as I said I don't think I'd need a lot. Thoughts?