Are you looking for integrated products? IE, a radio or fan with built in solar panels and battery? Or are you looking for DC powered radios and fans which could be run directly from a solar panel/battery system?
In either case, what size/application are we talking about?
For DC gear to add to a solar power setup, the immediate cheapish options that come to mind are car stereos, and standard computer fans, both of which are 12V and often available cheap/free to the scavenging sort.