Yeah, looking through the listings, there are a lot, though most priced between $400-$500. One thing I did notice though was one person had listed their Note for $299 about a month ago and relisted again at the same price earlier this week, so if that person is having trouble selling theirs at $299 I guess demand is just that low right now for the Note here.
Have you tried Swappa.com? Not only can you usually sell your device for a higher price, the fees are quite a bit less ($10 for selling and the usual paypal fees). Compared to ebay, they have a better reputation (clean imeis). At present, there are only a few selling for less than $400. Maybe, by adding some accessories, you could get a bit of a bump?
Being a Note 3 user, I was really looking forward to the Note 5. But, I constantly swap batteries. So, that's a disappointment, but because of fast charging, not a deal breaker. Believe it or not, the slimmer body just may be a plus? We'll see how it feels in the hand. If Samsung offers a 64gb model soon, and it's not terribly expensive, I would be okay with the sd card slot omission. Hopefully, some of the s pen improvements will be tempting. Also, I am interested in how the camera performs in real-world tests.
Since I am switching carriers (after 9 years, I am leaving ATT for Tmobile), I will have to wait a little while to upgrade (it will cost me $600-$800 to cut ties with ATT but will save over $1200 for the year). So, I will be reading the ensuing posts for some hands on experiences. Can't wait.
An added thought, the price of Samsung's flagships is going to be a barrier to getting more mainstream customers on board. Yes, Apple has been able to get away with it, but they are the only one to make ios devices. However, Apple isn't immune to consumer's reluctance to paying these high prices; the iPhone 6s will not come close to selling as much as the 6 and 6 plus did. Part of it is that the upgrade probably won't be that great ( the larger screen made a huge difference and it's been done now) and the China market is expected to be less, but also, the prices are getting too high. With Motorola coming out with pretty nice mid-tier devices, many will not pay the price Samsung hopes.
