Well, according to Wikipedia, Snocap was acquired by another company in 2008, which was itself then bought out by MySpace at the end of 2009. So the stores I originally had here are, alas, no longer functional, but a good bit of Jimi's music IS still available in digital format; here are a few links to get you started.

Myspace has quite a bit of stuff available to buy, both from Jimi specifically and Survivor as a band.
(And, of course, if you're a member, you can add tracks singly or in combination to your profile without actually buying them.)

Amazon has a nice selection of both Jimi's own and Survivor's back catalog in digital format, also.

I'm given to understand that at least Crossroads Moment (and probably most of the old Survivor albums, too) are available from iTunes, however I can't confirm this as I don't personally use the service. (I'm a firm devotee of Linux and have developed the accompanying general impatience with DRM of any kind, as well, so when it comes to digital music players, I'll take anything BUT an iPod, thankyouverymuch...)

If anyone knows of any other good sources (preferably subscription- and/or DRM-free) for buying Jimi's music online, drop me an email and I'll see about adding them to the list.