Edited June 26, 2017
at 10:13 AM
This steel utility cart with removable sides and 1,000lb capacity is currently on sale at Walmart for $129.35 - $46.30 store pickup discount = $83.05.
They also have the 1,200lb capacity down to $93.00 - $2.29 pickup discount = $90.71. (Thanks to 44mickd for pointing this one out.)
They also have a 400lb capacity one (GOR400) for $67.98 - $16.17 store pickup discount = $51.81.