So I get lucky sometimes as when I click on a link from the listings, inside there eBay puts up links with photos to other sellers of similar items. I've gotten lots of insert tooling lately from China.
Now you will see the Aloris brand, high quality, but 4x-8x the price. I've not seen anywhere in my shop that that is needed.
Hope you see this private message.
Look at eBay, and Amazon, and do a general search for QCTP sets, if you don't have one on your lathe currently. I shop around. But even there, sellers on eBay may have a spelling error, or they don't have a keyword that you think is required.
As for the piston type, they just don't have the tool holder power. I've bent the height adjust screw (twice now) which is a long set screw into the holder with a large knurled wheel threaded nut. I did this on my large lathe, that is a geared head, and I was treppaning at the time.
ajoeiam: I just did a search for "QCTP number system" and I got a link to Phase II brand catalog online.
I've 3 sets of these. One is unused as it is the piston type. I have the 1xx size for my 10x24 lathe, and 4xx size for my 18x40 lathe. They are Phase II. I've been getting holders from Shars. I think the best price is from eBay, that I've found.