You can make your own wolverine-type jig - there's some great units posted up on here.. If nothing else, it could at least tell you if the wolverine type jig is what you want. And take up a few hours' construction time.
To borrow from another post, here are some commercially availible systems:
Wolverine: http://www.woodturnerscatalog.com/cgi-bin/shopper?search=action&keywords=oneway-wolverine
Woodcut Tru-Grind: http://www.woodturnerscatalog.com/cgi-bin/shopper?search=action&keywords=woodcut-tru-grind
Kelton: http://www.woodturnerscatalog.com/cgi-bin/shopper?search=action&keywords=kelton-sharpening
Penn State clone: http://www.pennstateind.com/store/lcgrind4.html
The tru-grind is highly acclaimed for sharpening gouges
Grow your own, the videos will help you with any of these jigs also..
Basic wolverine, 30 minute project:
http://www.penturners.org/forum/topic.asp?TOPIC_ID=12214
Slightly beefed up:
http://www.taunton.com/finewoodworking/pages/w00115.asp
http://www.turningtools.co.uk/widgets/grindingjig/grindjig.html
Full-out copy of the wolverine:
http://www.jeanmichel.org/Home%20Made%20Wolverine%20with%20Home%20Made%20Vari-Grind.PDF