There's one up on eBay now, but it's pricey (though it does have a best offer option).
There aren't always a lot of them up. I really hunted for a good 4-5 months and there were times when there were only 1 or 2 up at a time. Sometimes there were as many as 10 or more up at once. I would just make a search, save it, and add notifications to the search (you'll get an email when a matching item has been listed). The phone app is really handy for saved searches. Super simple to check on new listings which match your saved searches and followed sellers
Good luck!
