Frustrated with those one-time use X-Mas Tree plastic pins that can't be successfully reused in areas such as the door panels, under hood shields, or the like? Don't get boned paying $5 for a lousy packet of three or four at your FLAPS. Buy in bulk and save!

All kinds of neat push-pins, fasteners, and retainers for all makes and models.

Clips and Fasteners.com

And also:
PDQ Auto Body Supplies

 

my door panel is my truck at one point had 3 working clips. i bought a pack of (i think) 50 clips. greatest 15 bucks ive spent in a while

 

Found another good source today:
Northland Fasteners

 

Great link Vdub. Not to jack the thread or anything, which is a good one for the clips, maybe this addition for electrical connectors also will help members out.

http://dto.vftis.com/mopar/disclaimer.asp

 

Just used clips and fasteners for the wife's car. Good place and cheap shipping!