I was hoping somebody knew of an obscure website such as wegotussomepowerbookadapters.com. I have seen one or two 500-series machines on eBay with power adapters, I suppose I'll have to pick one up and hope it's not as screwy as this Duo I just bought.

In the meantime, I've replaced the dead fuse and superglued and duct-taped the old power supply back together, and it's working fine.