If it is an ebay vendor that also sells ornaments, toys and trinkets then, well...
I have posted about that particular vendor before.
My advice is to find some people who play tinas. Listen to their playing. Often they know of a decent instrument that migjt be for sale, or even let you try one out.
You will find one much cheaper than £900 if you keep looking. Some might be coming up, but not for sale just yet. They tend to arrive in threes I find!