Yes, they are not cheap, but a google search may get you good results.
Personally, I do not rebuild the spindles unless a customer is not concerned about holding very tight tolerance. I send mine to C & M precision spindles in Tualatin, Oregon. I have been doing this for about 12 years. For about the cost of the bearings from Hardinge, they will rebuild the spindle, pre-loading it correctly and regrinding the spindle tool holder surface while running in the new bearings to get the runout at close to zero as possible. I cannot do that in the field.
1-503-691-0955.
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)