A: The original tins that Andy used when he created the Homeworlds sticker are no longer available, but as of Oct 2023, here are the results of our search for new tins. Note that many of these listings may not be valid after a while. Feel free to let us know if you find that some result is no longer there, or you find some good option we should add. These are almost all US-based listings, but one company is in Canada (at the bottom).

Searching for 8oz flat tins gets you approximately the right size. Note that some specify steel, which is stronger than other options. Smaller quantities are listed lower.

https://www.containerandpackaging.com/products/round-tin/M549
Available as single units.
$1.06 apiece
material: steel

https://www.specialtybottle.com/metal-tin-containers/deep-flat-slipcover/8oz-tnf8
Scroll all the way to the bottom, to below the table of contents. Available as single units.
$1.71 apiece
specific metal not mentioned

https://candorasoap.ca/packaging/tins/flat-tin-set-8-oz.html
Available as single units. Canada
CA$2.75
specific metal not mentioned