I found a sample pack of the new Tena Slip Active-Fit Maxi on EBay in the US. It's not cheap, at $15 for two diapers, but not too bad considering this guy has to import them from overseas. Plus, it's free shipping. It's worth it if you just have to try them. I couldn't help myself because I loved the Tena Slip Maxi's; they were my favorite diapers. I've heard from some sources the active-fit may be even better!
Ok, here's the link: