I use Pipette Supplies as my go-to source for all pipettor parts and consumables. Prices on OEM consumables are always competitive.
I am responsible for maintaining about 150+ pipettors from multiple manufacturers. PS has hard to find parts for many of the older tried-and-true pipettor models.
Prices for new equipment are very reasonable too.
I have never been disappointed in any way by Pipette Supplies.com!