The prices will vary based on the shop. I've talked with a few places and found the prices a bit higher this year...starting around $12. However, as HouseDragon mentioned all patterns are free; so you can pick and choose the row kits you really, really love. A number of shops are creating their own fused applique pieces so that will figure into the cost (and a time savings for you!).
I'm planning on touring the western UP of MI and northern WI to MN. It's a lot of driving compared to going to the Green Bay/Appleton WI area, but I'm sure the drive will be worth it.
Some shops will have pins in addition to the license plates. I've seen the license plates used on summer totes--what a great Road Trip bag.
Enjoy your trip!