I bought one similar to this
for $80 today at my Costco. It's a great unit and well worth $80. It's, strong, well-designed, light and fairly compact. I couldn't find it listed on Costco.com. The only difference I can see to mine and the ones listed below is that instead of individual grips, mine has a plastic handle that spans the difference between the two handles, and it also has 2 additional vertical supports equally spaced in the center. The layout may be slightly different, and stronger in my opinion. It's a really slick design, and converts from one setup to the other in a matter of seconds. You can't go wrong with this one for $80. I think it goes back to $100 around the middle of the month.
I am not sure what the differences are, but Amazon sells one for $157. https://www.amazon.com/Cosco-Alum...B00HOGSOPG
And Home Depot sells one for $157 also. http://www.homedepot.com/p/Cosco-.../205035247
Here is the exact one that you can purchase for $80 at Costco. http://costcocouple.com/wp-conten...stco-2.jpg