Keyless Entry?

We just bought a brand new 2006 G6. The dealer told us it was "fully loaded" so, of course, we figured that included keyless entry. We were so excited about getting it that we forgot to ask about it. When we went to pick up the car, we were told it did NOT have keyless entry. I've heard that you can install it yourself and I'm wondering if anyone has done this?
I really don't have a ton of money to get it installed. I thought the keyless entry was standard with the G6, especially on a 2006, but obviously I was wrong.
Any ideas?