There's really not much of anything to sell. It remains to be seen if Vargas will even be back before the deadline. I know some people have tossed out Kendrick as a trade possibility, but I don't see it happening. Same with Bourjos (who's like Vargas, and probably won't be back, anyway).
Who else is left that is realistic? Downs? Callaspo? Shuck? Williams? I can't see any of them bringing back more than a fringe prospect (Downs might have the most value--but, still, can't expect much for a middle reliever with an expiring contract).