Well relatively cheap anyway. I just bought a boxed set of 18 ER32 collets, 3mm-20mm, made in Germany, for =A370 brand new from WNT in Sheffield. They aren't the super precision 6 micron runout collets but the 20 micron jobbers. Still far more precise than I'll probably ever need to cut to anyway. They've got a special offer on these running to 30th November if anyone else needs some, but you have to sign up for an 'account' before they will send out their tooling catalogue.