I get the 6.5" from Westbrook Dog (AMD's site). Zoey much prefers them to Merrick's, which are indeed extremely stinky!
Merrick's are more expensive, but last much longer, so I think they end up being more economical for a tough little chewer like my Zo. And heaven knows, money's tight.
However! I buy AMD's anyway, because Zoey absolutely insists on it.
Plus, I like AMD and she's very customer oriented. A killer combination.