I found a website with a lot of special and limited version of Rider Heroes Series (RHS). Some are special event prize item while some a exclusive gift item comes with merchandise such as megazine and games. The newer limited version is called as heavy painted version. This version looks nicer as each figure are painted into more detail version unlike normal RHS comes with basic color painted on body. However, heavy painted version is not cheap which each figure cost at least 1000yen although comes with merchandise. Check out the following website if you want to know more about RHS limited version.
RHS limited (Direct to 3rd party website)