What to do with this old phone?

I have an AT&T 8525 that I've held onto for too long. It's been a good emergency device, as my wife lost her phone a couple of times and she was able to stay in touch that way. But it's not needed anymore.

I've got it (near perfect), some accessories (headphones, adapter, charger cables, etc) and I might have the paper documentation that came with it. It's in great shape, but it's a seriously outdated phone at this point. Would be great for someone who just needed a caller and a texter.

Sell it? I quit eBay and Paypal, and I'm not looking forward to returning. I have an Amazon account, I suppose I could open a store and try to sell it that way. But at what price? Craigslist?

Or do I keep it or just donate it. I understand this won't fetch much.