Yes, I too would be interested in an alternative source. I'm having trouble locating your reference.
I did just get some of the .44 mag ammo boxes and they work for both KR808 and 510 cartomizers. Still searching for one to hold all my KR808
batteries vertically, but haven't found the right height yet.
They were the cheapest at Cabelas.com. Checked ammoboxes.com, Midway, and eBay. Most places have UPS shipping as the only option, and it was about $10. Cabelas had regular USPS priority for about $6 I believe. And they are good and thick. I also bought two more that were slightly too small for cartos with the rubber condoms on, so if anyone needs ammo boxes for actual ammo, PM me and you can have them for a small donation to my favorite charity.
Please let us know that link if you have time. Thanks.