My advice is not to buy anything without having tried it. Even if you think you are buying a good quality make, and the price appears to reflect this, this is no guarantee that you will get what you want.
I bought a second hand pair of Leitz Trinovid 8x40s with rubber armor in 1997. They were about £350 from a camera shop in Bath, the new generation Leica of the time were £650. The glasses I got were and are excellent, but sadly I don't use them nearly as much as I would like because of the weight. They are great in the dusk, but you need to know you are going to be using them to go ahead and pack them. This isn't an advert for premium glass so much as a warning about buying bigger than you really need.
My mum did very happily for a number of years with a pair of 8 or 9x26 Practica things that I picked up in a Hong Kong camera shop for about £20. She would still be happy with them except that the faux rubber armor, more like just ruberised surface, suddenly and spontaneously perrished and went all gummy. It took about six years before that happened, so she did get some use out of them.
Since a new pair were needed I went shopping last year and tried out quite a lot of little glasses. I bought some Nikons for about £80 that on paper looked just the thing. The were total carp and were promptly sent back for a refund. I was quite impressed by Opticron Taigas, could focus way out there, fairly solid, not too much backlash in the focus mechanism. I was impressed with some small Steiners too, but after trying those, and a whole bunch of Minox, I would up with an ultra small set of Zeiss for about £250.
Again, not an add for the most expensive things going, they happened to tick the most boxes of everything I had found.
I wanted very compact and was then told they didn't need armor, I wanted good roll down eye cups to use with eye glasses, the focus had to be solid and free from backlash, the image had to be bright and fairly distortion free to the edge of the view. I wanted good range of focus (the Nikons quickly maxed out so anything from about 60m to infinity had to be viewed on the same setting). I found that going and trying lots of glasses was better than surfing any number of internet pages. There was quite a lot of difference between models/ranges even within the same brand.
Charity shops around here don't carry any glasses to speak of. Camera shops seem to have higher odds of success for finding some second hand binos, but you could still have to cast a very wide net.
