Hi and welcome.
There is the Marrakesh cage which is expensive at around £129 from Zoolpus.
This is one video of my setup in that cage
https://www.youtube.com/watch?v=4S0szVnl7IM&t=15s
and I have a whole thread about the cage on here
Skyline Small Pet Terrarium Marrakesh
I also have the living world eco habitat which is bigger, height wise and width wise, again expensive at £134??
video of me setting it up
https://www.youtube.com/watch?v=wYUtUq9eqzU&t=4s
and a thread all about the cage
Living World Eco Habitat Cage
There are also the zoozone type of cages. You would want to be looking at the large which is 100cm x51cm x 37cm
Viovet are currently out of stock (normally £58 but they seem to have it at £48.69 at the moment)They are hoping to have it back in in a couple of weeks, everywhere else on line seem to be out of stock or have it at expensive prices.
https://www.viovet.co.uk/Zoo-Zone-Cr...ck_find=320532
Jolleys also sell it at £55 if there is one near you and they have it in stock - you can't order it online,
There is also the Maxi duna multi - normally around £100 I think but this place seems to be selling it for £70 with £5 off
https://www.zoomalia.co.uk/pet-suppl...m-p-11750.html
You will need to mesh the lid on the zoozone and the duna mulit, and possibly the eco habitat, depends how you set it up.
There is the Rodipet cages
2 sizes- 100cm and 120cm - but even more expensive than what I had already listed
https://www.rodipet.co.uk/cages-runs/laola-nagarium/
There are a few companies such as this one on ebay that make tank like enclosures
https://www.ebay.co.uk/sch/libar-905...p2047675.l2562
There are pawput cages if you don't mind the risk of getting a wooden type cage
https://www.amazon.co.uk/stores/PawH...4-A6A769C74485
Other than that I think you are looking at tanks like you say or an ikea hack - detolf/linnmon/billy
there is the Barney cage, but you said you didn't want barred
Hope that doesn't overwhelm you
I have been doing a lot of research for Robos for a friend!