Sorry but I have no idea on pricing but the Williams Optics redcat (and other) series get quite the rave mention in here along with stunning images starting with the 51mm I believe. As for used, there's many a nice rig comes up in the classifieds at very reasonable prices and I'd keep an eye on them or put a request in the wanted section. I think they have a 51mm, 62mm 72mm, 80mm and the size just keeps going up along with the price but from what I've seen and read on here it would be my brand choice especially with portability in mind for camping where size and weight are often a consideration. The prices also reflect whether they are a doublet or triplet set-up and I'm not familiar with the range and what has what.
The Skywatcher 80ED also seems to get good reviews and be a highly liked unit but I'm not sure on prices or the physical dimensions of the unit but a quick Google search would soon show the information.
From experience with other cheaper scopes (original William Optics Megrez 80mm), an amazing little travel scope but not the optical quality of the redcats (much older) but maybe with an 80mm you won't be getting the wide filed you want, I haven't looked into any of it because its all beyond my price range.
https://williamoptics.com/collections/cat-series
These are American prices I think but worth a look.
Good luck and clear skies!