Hi Beth,
The mini suction cup is the same as the small suction cups at the quilt stores that are purple. I have one and I use it all the time. HF should have the refill blades in packages for purchase that work in our rotary cutters. You should not have to buy the carpet cutter to get the blades. Please be aware though that the blades are very very sharp. IMHO I think they are much sharper starting than our quilting brand blades.
Always be careful when cutting your fabric. Don't cut when you're tired as I did and ended up cutting myself. It's better to go rest, get some sleep and start again the next day when you're rested and fresh.
Have a Great Quilty Day!
Pam M
Dayton, OH