Rockr Pod Lite in UK

Trying to find the Rockr Pod Lite or similar in the UK ($75 shipping to the UK from the US!).
Any suggestions?
Failing that it doesn’t look too hard to make one but I guess the compound curve on the bottom is the tricky bit. Any thoughts on how to generate that curve?
Many thanks,

For starters, here is the list of rocker makers I have within the UK region:

Additionally, if you are explicitly searching for a rib style rocker, the one I can think of that might be a closer reach for you is the following.

I may be able to help you find other options if I know more about your budget and goals for a rocker.