Here's some others [link=http://www.rcaerobats.net/Mintor/3M_140S_Main.htm]My Mintor Page[/link] listed...
Mac's 1290, slightly louder, from Mac's - $80
KS1015, from Desert Aircraft - $125
Bolly EQ120R, from Bolly North America - $140
Hatori "Real" 140 pipe, Radio South - $155
"Clone" of the Hatori, heavy, but works FINE, Just Engines, England - $80

Good, quiet pipes are worth the price.