Just noticed CDCO has a MT2 or MT3 collet ER collet chuck with 8 collets (1/8-5/8 x 1/16) on special for the princely sum of $58.
The range of collets is not as close as my 1mm set but for most pen turning 1/16 is fine.
It is a good price for the set but I wish it went up to 3/4".