The guy who owned my 09 ST1300 before me has a set of Staintune Slipons for sale. He took them off the bike before he traded it and put the OEM's back on.
The ST had done 16,500k's when I bought it, I assume the Staintunes saw most of that. He says they've been polished up, put back in the Staintune box and there's not a mark on them. For what it's worth the bike was immaculate when I bought it, a credit to him.
I understand he want's about $500 for them and he might even fit them for you if you ask him.
If you are interested PM me and I'll give you his contact number. I don't have a financial interest in this, he's just a good bloke.