There's always the Sportwerks .26 from amain for $119... Awesome engine.. Have one in my Savage and it's a screamer.. Including shipping mine was like €90 or something..(when the exchange rate was a bit higher.., but still..) I really don't think you'll find a better deal than that.. With the stock Muggy pipe I get EASILY ten minutes to a tank on my Mach 427(identical to SW 26) in my Hyper ST.., so run time's not an issue, it being bigger than a .21.. I'm kind of playing with the idea of getting a buggy, and if I do it'll be getting a SW 26 with the closed backplate (part # SWK8057 )

Another option would be to find someone selling a Mach 427 out of their Losi truck/buggy/truggy....