If you're willing to learn, try doing it yourself and save some money... or get a friend to do it and get them sloshed when they're done.
If you can get yourself a free afternoon, doing it yourself isn't hard - you just have to be willing to try stuff. Check out the Tutorials forum, I think there's something on there about amp installs... it not, give me a buzz, I ran mine myself and am pretty happy with the results. You'll need an amp wiring kit - what's the power rating on the amp and subs? I'm at work so I can't see the picture, sigh... Anyways, it's just a matter of being "creative" and figuring out where's best to run the wires. As a rule, keep the power wires and the input wires to the amp away from each other, like on opposite sides of the car, to fight off interference. But yeah, it's not as hard as you might think, it's more of a "It looks like a big project and that intimidates me" issue.