As I am uneven on my weights at home, I decided to offer some items for swap on Vintage Weightlifting Swap.
The items certainly had positive comments. I listed for sale or trade.
Joshua Kost - interested in 5's. typically worth $2-3/lb; 35's go for $1-$1.50/lb in his area
Derek Zielinski - interested in 5's. had a bunch of round heads 4-4-6-6-7-7-7-8-8-9-70-70-75-75
Marc Wagner Salvage - interested in 5's at $3/lb
Antonio Rodriguez - seen 20-20-30-30-40-40 recently; willing to buy from Play it Again Sports and ship to me (Large Flat Rate Box = $21.50 each and would need two). Very thoughtful.
Cholo Herrero - has a pair of 30s if I am interested. He also had a single 25 (USA stamped) and a single 40 that I was interested in and we struck a dealer. I pay to ship my 35s which will be $43 and he will pay to ship his dumbbells. My net is $62.50 + $43 = $105.50 for 65# of DB or $1.62/pound. It is high side, but not terrible. I have paid $2/pound locally and have also been fortunate to find $0.83/pound locally. His dumbbells arrived well packaged and as described.
I am under the impression that the 35s will not have any takers, but the 5s are certainly more sought after. I could expect a pound for pound trade. For example 5# plates for 5# dumbbells or 35# plates for 35# dumbbells.
I would definitely be willing to straight up swap the 35 pound plates for dumbbells (35, 40, 45). The problem is flat rate shipping would be $21.50/box for two separate boxes. I would also swap the 5 pound plates for dumbbells (5, 6, 8, 9, 10, 12).