Hi,
with hand-held binoculars it's usually a smaller field of view, smaller exit pupil in comparison to models of comparable size but lower magnification and most of all, the increasing difficulty of holding the instrument steady enough to actually see more (you can cheat in the latter department by buying a pair of Canon IS of course ;-)
In that case looking for sth used might be a good idea... if you can fit the following into your budget, you could do a lot worse...
https://www.cleyspy.co.uk/opticron-dba-10x42-oasis-wp-s-coat-ref-11786.html
This was Opticrons top offering back then and cost 900 quid - the following review is a bit lackluster due to these facts but for 300 quid you will be hard pressed to find a better view.
https://www.allbinos.com/150-binoculars_review-Opticron_Oasis_10x42_DBA.html
Or this one - it's not Canon's top dog, the legendary 10x42 IS, but you'll see a lot more in these stabilized ones than in other 10x bins due to no shakes... otoh there's a lot more delicate electronics and mechanics in there to break than in normal bins and of course batteries to forget....
https://www.lcegroup.co.uk/Used/Canon-10X30-IS-III-_251605.html
Here's a review of it's grandfather, the 10x30 IS - the optics has not changed a lot in those but the stabilization has been improved with later models...
https://garyseronik.com/review-canons-image-stabilized-binoculars/
Other places to look for used bins besides gumtree or ebay might be in focus optics, ffordes and of course the classifieds here...
When buying from a private seller as opposed to a business with a return policy, I like to be able to test the bins in person... I have made exceptions for sales in the classifieds here and have not regretted it.
Joachim