Do these come up for sale often? I'm thinking a portable one on a trailer? There must be someone who has one sitting around gathering dust who wouldn't mind taking a loss?

They do, but they aren't cheap. What are you looking to spend?

http://www.suzukihayabusa.org/forum/index.php?topic=153241.0
Try this...

By the time you add the trailer and set-up, its is closer to the 15 to 20K range. I was thinking of another one at the busa sight that I bookmarked @ 22K, but involves a domain and business.

I was thinking about this. But realistically would have to move the bay area to make if feasible to support a business

http://www.suzukihayabusa.org/forum/index.php?topic=152033.0

What about something like this?

http://cgi.ebay.com/ebaymotors/Mobile-Rear-Wheel-Motorcycle-Dyno-Dynamometer-_W0QQcmdZViewItemQQhashZitem2a1063084fQQitemZ180663552079QQptZMotorsQ5fAutomotiveQ5fTools

i'm not sure that it is an actual dynamometer that i need...

what i actually want to do, is to be able to run my bike through all the gears under some sort of load, while stationary in my garage. then make adjustments to my bike... and then do it again... and again... and again

we have one at our shop that is a trailer type. it works, but runs on older software. I'll ask the owner Monday

If you want "some sort of load", then an inertial is better than nothing. There is quite a abit of info out there about the different kinds of dynos. The first dynojets were pure inertial like that item. Folks were plenty happy with them for many years before others came up with load cell and eddy current variants that could do some version of variable loads like the bike encounters in use. The rhetoric is the latter is superior, but there is tons of thought on that. Google will give you hours of info to read thru the differences.

If you want to run your bike on a set of rollers that moves a large drum with some software that consistently does the same thing, no doubt that ebay thing would do it.

The others are next gen with more sophisticated software. The axiom that comes to mind is, "you get what you pay for". But sometimes if all you want is measure how long a thing is, a .99 cent ruler gets you there without the need for a a $50 digital caliper.