In case anyone is in the market for an top entry litter box, Amazon currently has one at a pretty decent value:
https://www.amazon.com/gp/product/B075VTWX7V/
I purchased it a few days ago for $24. It has dropped down to $15. MSRP seems to be around $30 and other colors are listed as such.
Sold by Amazon; Free Shipping with Prime.