I have got a Mooncup but didn't persevere with it. If you are thinking of getting one get your google-fu on - there are quite a few different brands although I don't remember if any other than the Mooncup are easily available in the UK.
As for the Shewee...
A friend (yes a friend, not me, I tease them about this regularly) decided to fashion their own by making a hole in cardboard beer cup. Needless to say it ended in disaster with 'favourite knickers' having to be discarded in a Glastonbury portaloo.