In reply to Si dH:
I got a small microscope for a similar aged child (well, for me really...). Getting them to use an eyepiece reliably and satisfactory is not easy; lots of frustration abounds. I've ended up using an eyepiece camera on to the computer (Raspberry Pi 400) monitor.
Once you make the step to using a camera, if you already have a dSLR and a tripod and a decent lens around 200mm to 400mm, you can get surprisingly far with a home-made "barn door" 1-axis tracking mount and a 2x extender... If you just have to buy the extender and the parts for a barn door tracker, it'll be in budget...
Sorry, totally didn't answer the question (for a change).
In reply to Bottom Clinger:
> I’d get the mods to quickly change the title if I was you...
Most people don't think like that; can we get you some mind bleach instead? I did once have a random parent come up and have a go at me when walking along a beach in Gairloch carrying a 200 mm lens on my dSLR, slung over my shoulder, with the lens cap on, because their were children present. They were not satisfied with my response.