Amazon Glacier is an extremely low-cost, pay-as-you-go storage service that can cost as little as $0.01 per gigabyte per month. What would be absolutely fascinating is a pay-before-you-go storage service — data cryonics. Paying $12 to store a gigabyte of data for 100 years seems like a pretty intriguing deal as we emerge from an era of bit rot.
I'm not sure what kind of organisation I'd actually trust to store data for that length of time - a commercial organisation is probably going to be more effective at providing service but what commercial organisation would you trust to provide consistent service for 100 years? A Swiss bank perhaps? Governments of stable countries are obviously capable of this (clearly they store data for much longer times) but aren't set up to provide customer service.