I bit the bullet and ordered some joe cell tubes from ebay. I am happy with the
service overall. The seller (iztex) cut me a deal and dispatched the package
fast enough.
I did ask beforehand if there was any magnetism on the tubes, he said no but I
found that there is residual magnetism at the seams.
I think I can work around that though.
If anyone is looking for steel, I recommend this seller from USA. Just be aware
of the seams.