I used a service to get my feet wet and to buy time to stock up on CD and it was the same price as buying 7th Gen disposables.
I agree with PP about buying your own. I might just do a service the whole time if I had more money than time or was grossed out by the laundromat and/or handwashing (I live in an apt with no hook-ups).
I use a service and probably always will. It just works for our family. It's $75/month. They drop off prefolds and a liner and provided the pail and deodorizer disk (monthly). We use mostly Blueberry covers. We use disposables at night and occasionally when we're out an about or traveling.