I think the only place to buy ITX initially will be at
www.ballisticproducts.com. BUT I do not think they are 100% out on the market just yet. It is not listed on their website anyway.
Like Pletch said, testing/development is still being done on ITX, but the prospects seem very hopeful. I am very thankful to the guys who are doing the testing. They are actually guys who frequent this board and they have "no dog in the fight"... so the integrity of the testing will not be in question.
Yes, ITX shot is pretty expensive compared to lead, but it is actually one of the most affordable non-lead shot products out there today from what I read. I would guess ITX roundball will be priced as low as possible, but it is a bit more of a process to make this stuff than just runnin lead ball by the campfire...
I know that the ITXball will be sold in small quantities--- this is pretty much a hunting option, not a large quantity plinking option. I figure they will be cheaper than a fancy whizbang sabot, but it will be more expensive than lead. That is why it is so important to make sure this product is as close as possibly ballistically speaking, to lead.
As far as the small flat ring surrounding the ball? I personally found that it did not harm the accuracy at all --at least at short ranges. I loaded it parallel to the bore, and did not find that it made loading difficult at all.
Ken