https://www.amazon.com/MidWest-Critter-161-Leak-Proof-Measures/dp/B001NJ0DAE Critter Nation cage is my recommendation for a cage. for 2 rattos just the single level should be fine, and the cage front opens completely making it easy to clean and get around it setting up stuff. I am unfamiliar on the cage you mentioned and it may be great as well.
Make sure you are getting girls only, and that they have been housed away from any males, this situation is ripe for an accidental pregnancy with her. it may be part of the reason they are waiting a couple weeks to see if she is already. but even at 2 weeks it can be really hard to tell if they are pregnant.
Best of luck, rattos are great pets!
A single story Critter Nation might be a tad over your budget but you can always try to find them second hand. There are similar cages but these are the gold standard both in terms of size, quality, and ease of cleaning-those doors are nice. (Well, except when they're accidentally run into)
If you like, feel free to DM me for more info/advice OR try posting to r/RATS since they have more members and thus more people who could comment ;)
The single unit Critter Nation is a really fantastic frame. The Prevue Dusted Rose cage is a little smaller and a little cheaper. This cage might be an okay budget cage as well as this one.
sounds like you're u.s. but need country and budget
if you are u.s. then critter nation is hands down the best cage available. a single brand new is gonna run you about 200$, expensive yes but trust me, BEST CAGE! i have both a deluxe and a single and 6 boys between the two cages. its got large double doors that open fully making cleaning/decorating easy and its on wheels plus if you get the single you can safe up for the addon later and turn it from a single into a deluxe that way
for ferret food. That Marshall's ferret food is crap for them
Do Not Use Any Kind of Old Tube, Also you do not need to bathe ferrets at all.