does anyone know how much it would be to get power door locks for an 03 coupe?

you can find a kit for 30 - 50 on ebay

pretty much any aftermarket actuators will work you also need 2 5pin relays and a keyless entry module. some of the better keyless entry kits have the relays built in.

If he buys a power door lock kit it will come with everything needed. And if he just want power door locks and not the keyless entry he wont need the keyless entry module

www.autoloc.com and www.autodax.com

both are awesome sets and work well, and easy to install.

Ive got one of the sets from autoloc. It was about 60 shipped and it works great.