Don't print them very big they aren't that good. The light is boring and flat, the composition isn't very interesting and the sky is generally blown out and overpowering.
If you take them to a frame shop and get it framed there you will spend between 80-120 bucks a picture depending on where you go, how big they are and what materials you use. If you print them in a standard size you can find do-it-yourself frame kits at art stores for around 20 bucks.
Look at
www.mpix.com or
www.adorama.com for printing, they do a great job and the turn around time is less than a week.