SPOILER hidden -> highlight start: Mutation is the key to some reptans and the ridgeballs. Start out with a Tilia Scanden and it will go to either a reptan so something else OR work your way down with a Citrus. As for a Ridgeball, start with a spotted ballcactus and work your way to a ridgeball OR try a spotted Multiflora and you may get one. <- end here.

Because as I have watched the store seeds, I don't think either of those seeds turn up. (But don't quote me on this)