Hi Dennis.
i got mine thru Ebay ( Aust) $17.99 Aud incl postage from Hong Kong.
You can also bid, instead of "buy it now"
but watch the postage costs. http://tinyurl.com/nw4pc

it's a bit cheap & nasty ( haahaa) but I didn't want to buy an expensive one . The one's I looked at a while back in retail stores here , were about $99, too much money, just in case they didn't work with omb.
Definately makes things easier.

I'm actually using my Clavinova as a controller & for main melody piano voice & a mix of sd1 & Clav xg voices for the styles.

Could be a good way for you to use midijay voices with omb/psr styles. Saves converting psr styles across to ketron.
I've tried converting a couple of my favourites across to the sd1, but I've had a couple of hassles with Intro's not converting properly, especially in minor keys, so I'm still using OMB. It's like having a second keyboard.

If I can be of any help , let me know.

best wishes
Rikki