Costco has the Chef's Choice Model 115 Knife Sharpener on sale for $69.99 (plus tax) shipped after $30 discount on their website.
Not sure if this is also available in store.
Costco link [costco.com]
Price is valid thru 8/18, or while supplies last.
3-stage Diamond Hone®
Sharp Serrated and Fine Edges
High Precision Angles
100% Diamond Abrasives
125 Watts, 1-year Limited Warranty
Looks to be similar to the model 120 which sells for $120-$140 elsewhere, but model 115 may be a Costco exclusive model.