Hi Kelly,
Welcome to the forum. Here's a link to a site that was, for a while, THE place to go for i-series boards. Most of the content on the site is still available and there is a lot to be learned from it.
I can certainly vouch for the build quality and durability of these older Korg boards having owned an i30 since 1999.
Here's the link:
http://silverhawk33.tripod.com/id10.html