Certainly not from the most reliable source, but I've learned long ago that the truth is always sharper than the axe.
National Memo Excerpt:
According to Stone, the billionaire Koch brothers purchased the Republican vice presidential nomination for Ryan from Romney in late July by promising to fork over an additional $100 million toward “independent expenditure” campaigning for the GOP ticket.
Any such transaction would represent a serious violation of federal election laws and perhaps other statutes, aside from the ethical and character implications for all concerned. Although Stone is not the most reputable figure, to put it mildly, he has been a Republican insider, with access to the party’s top figures, over four decades. His credentials date back to Nixon’s Committee to Reelect The President and continue through the Reagan White House, the hard-fought Bush campaigns, and the Florida fiasco in 2000, when he masterminded the “Brooks Brothers riot” that shut down the Bush-Gore recount in Miami-Dade. Peruse his site and you’ll see his greatest hits and the attention he has drawn from major publications. more>>>
In fact, I'd say the chances that Romney sold the seat are so great, they practically needed a cock-eyed story like this to pre-empt any ideas that it is even remotely true.