I have a 19 piece set of ER32 collets and a MT3 collet chuck that I got off ebay, I find them to be spot on for me. I havent checked the collets themselves with a DTI, but I did check my collet chuck for runout and it was within 0.02mm. I love my ER32 collet set, and I really want to get a proper ER32 chuck for my lathe.
I got hit with import duty, which of itself was only about a few pounds, but for the priviledge of relieving me of that, the post office added another £8.00 on top. Just something to be aware of that the eventual price you pay may be a bit more than 1st expected.
Tim