Are the different slide soles expensive ? How many comes with a purchase of new shoes. Thanks

The BOA Color Shifts are THE 9's, and the slide soles are fairly pricey.  All that comes in the box is what will fit on the shoe, which is the 8 sole and 5 heel, which is the most common pairing in their estimation.  There's no change to the heels, so they're the same as they always were, but the soles obviously have been changed, so that's really the biggest expense if you want to change them.  They're also sized to fit the shoe as well, so you'll have to reference a size chart to make sure you get the correct size of sole for the shoe. 

So if I need a slide sole when its to slick or another if I'm sticking what dollar amount would I be looking for 2 additional ones. Just wondering if its worth it. Thanks for the input from everyone.

Just made the purchase today first pair in a about 4 years. Hope these last just as long. Thanks for all the informative insight on the shoes.