Right there with you on the keyboard shopping; it's an expensive potential mistake to make.
I'm reading a very helpful book (It's Not Carpal Tunnel Syndrome) that is showing me the root causes of my RSIs, and the keyboard is only part of what for me is a pretty ugly picture that's developed over several years. If you go to the author's blog - rsirescue.blogspot.com - and look on that page for "Our Theory in a Nutshell" you can get a quick overview and see what I mean.
I realize reading a book won't provide an immediate solution for your problem, but since I've been trying to sort through the keyboard issue myself and only stumbled across the book (which has so far been extremely helpful) I felt I should mention it. The book helped me realize a better keyboard will address some of my symptoms but not all of them and not all of my problem.
If you've just started having RSI symptoms maybe the right keyboard would provide some quick relief and you can use the "Not Carpal Tunnel" information to keep it all in check. I have spent too much time and money chasing after solutions I hoped would be a silver bullet, only to find that they were either harmful or only partially helpful. RSI relief is turning out to be a puzzle with many pieces.
All that being said, I stumbled across this page because I searched for the same thing you were looking for. The authors of the book provided a resource list that included a link to a site that did rentals. Now it's just a linkfarm :( I found a couple of other results that led to sites with rental programs, but they were only local. Would love to find a rental but if that doesn't happen within the next few days I'll pick one and buy where there's a good return policy.
I'm reading a very helpful book (It's Not Carpal Tunnel Syndrome) that is showing me the root causes of my RSIs, and the keyboard is only part of what for me is a pretty ugly picture that's developed over several years. If you go to the author's blog - rsirescue.blogspot.com - and look on that page for "Our Theory in a Nutshell" you can get a quick overview and see what I mean.
I realize reading a book won't provide an immediate solution for your problem, but since I've been trying to sort through the keyboard issue myself and only stumbled across the book (which has so far been extremely helpful) I felt I should mention it. The book helped me realize a better keyboard will address some of my symptoms but not all of them and not all of my problem.
If you've just started having RSI symptoms maybe the right keyboard would provide some quick relief and you can use the "Not Carpal Tunnel" information to keep it all in check. I have spent too much time and money chasing after solutions I hoped would be a silver bullet, only to find that they were either harmful or only partially helpful. RSI relief is turning out to be a puzzle with many pieces.
All that being said, I stumbled across this page because I searched for the same thing you were looking for. The authors of the book provided a resource list that included a link to a site that did rentals. Now it's just a linkfarm :( I found a couple of other results that led to sites with rental programs, but they were only local. Would love to find a rental but if that doesn't happen within the next few days I'll pick one and buy where there's a good return policy.