Bowhunters Superstore has em, graygrouses (likely Dave does too by now)
http://www.bowhunterssuperstore.com/crossbow-accessories-excalibur-c-41_151.html
Personally I like my gear 'clean,' when hunting, don't even like the quiver attached to the bow while in the stand. I just think that extras affect the balance of the piece. View the cheekpieces as a necessary evil to enable better eye/scope alignment. That they do.