Where do you sell your used stuff?
I personally do a mix of Craigslist and Amazon Marketplace. CL would get me more money but Amazon usually gets things sold pretty quickly and they're upfront with you right from the get go about how much cash you'll be getting.
Then of course there is ebay, but I feel like they make it confusing on purpose; That and you have to fight with about 100 "power sellers" selling the same stuff.
There are also trade in sites like Gazelle, but they never seem to give you enough.
What do you prefer?