help with mp3 for a non techie?

for 3 years I have been running with an Toshiba gigabeat. I think it is about at the end of it's battery life. When I went to purchase another Toshiba, I can't find one anywhere and assume they don't make them anymore. I would like some info on buying another mp3. features it needs are an FM radio. ability to download from Windows Media player from songs bought from Amazon. I don't want to have to deal with Itunes from apple I tried that and it caused me nothing buy grief. I just want a simple dependable , easy to charge, mp3. no video, no pictures, just something to listen to while I am running or at the fitness center