Rowan would like to pick up a couple bicycles we could use for beach riding. So we've been to both tip shops near us and have had a look. There are lots of bicycles (all used, of course), but we have certain specification ... something that fits (or close to it), something with a frame in decent shape, something with as many workable components as possible, something that isn't too heavy, something that can take wide tires ...
There have been a few which might work, but we haven't decided yet.
I don't know how much these bicycles are going for, but I wouldn't imagine it would be very much.