I would really appreciate it if someone could tell me the cheapest place where I could find some power door lock actuators for my 90 f150. Both of them are out.

 

I had to replace the drivers side one in my truck a few years ago, and I bought mine online from Atascadero Ford, which became FordPartsOnline.com, for just under $100. That was about $25 less than I could find it anywhere else.