I have been making my own for years, as we do have a terrible selection here. I tend to buy things that are pretty rubbish and modify them to how I want them, or I have used household items such as rotating fans, revolving xmas tree stands, moving kids toys all sorts of stuff, pull them to pieces and make my own. There are some great ideas on here, depending on your theme, I've done themes such as Thriller, Scary Fairytales, Pirates of the Halloweenabean and I've just started on Creepy Carnival for this year
It looks like they operate seasonal retail stores modeled after stores in America. They only list locations in Ireland in 2014, but their About Us page mentions Halloween's growth in Ireland and the UK, so maybe they will expand to the UK.