For A/C Delco, I go with www.rmsautoparts.com
. They cater to the F/Y/B-body crowds, but a lot of the peripherals are common (02 sensors and such), and they can get anything else quickly as well.
There'* always Dal at VanDevere Olds at email@example.com
, or (for a quick response) call (877) 448-5451. Call early, though.
Those two give about the same pricing, which is cost + 10% on most things (GMPD pricing, or a little better), with reasonable shipping.
EDIT: I should have read the post more carefully, as I it'* referenced above.