Sure!

Here's from Amazon: https://www.amazon.com/MidWest-182-leak-Proof-Shelves-Measures/dp/B0054U8UGW

And from Walmart: https://www.walmart.com/ip/Midwest-Deluxe-Ferret-Nation-Double-Unit-Cage-Model-182-Includes-2-leak-Proof-Pans-Shelves-3-Ramps-w-Ramp-Covers-Measures-36-L-x-25-W-62-5-H-Inches/16901121

It's the "Midwest Ferret Nation Double Unit Ferret Cage" and usually some other keywords, but the double unit is the one you're after for the two-story and big. The shelf on the bottom is perfect for treat and toy storage.

Thanks! I have the ferret nation with the critter nation add on in the middle but regretted it since the bars on the CN cage are so flimsy and break easily.

These Ferret Nation or Critter Nation cages are the perfect size for them. https://www.amazon.com/MidWest-182-leak-Proof-Shelves-Measures/dp/B0054U8UGW