Nubo,
Cabela's DOES carry them.
Remember with average sight and rest an 8" is going to give you a bit of a forward tumble balance , while a 6" will give you a more neutral balance. The performance between the 2 lengths isn't enough to be concerned with so decide which style balance you prefer.

actually if you do get the 8" the stud is reversible, so if you prefer more weight closer to the riser you can swap it. They are weighted 60/40 in the dual chambers with the majority of the weight out front.