According to the fan (Uchiwa?), the decals are a free gift from some event (probably requires registering and a lucky draw).
They do not come with any kit.
The clear kit is just a clear kit without any Sheryl decals.
In other words, the Sheryl decals are just limited items by themselves.
Also, technically speaking, they're not for sale
Just in case any of you are interested in what's in the clear kit, here's what the kit comes with.
http://page6.auctions.yahoo.co.jp/jp/auction/f76281551
Hope this clears up some stuff.