You're so lucky that the 'bubble' umbrellas have come back in fashion over the last two years. You can now get them from most department stores like House of Fraser or Debenhams. They come in all colours but they normally have a clear one too.
When I was looking for one a few years back, no where sold them and I ended up buying one from Target in America when on holiday, it only just squeezed in my case!
We stock two types one has a fibreglass frame, black graduating to clear handle and black edge. they retail for �11.50.
There is also one with an aluminium frame which is slightly smaller. It is available with five coloured trims and completely clear, retailing for �5.75
Sadly I have not yet uploaded them to our online shop at lovejoys-ltd.co.uk but if you have not yet resolved the problem email me through the site.