alternatives to trading on the trade thread.
IF everyone went back to selling their extras in the DD instead of hoarding them and waiting till they got the ones they needed then the DD would be overflowing with them. (pauses to day dream about a wonderful world) but people are greedy and would much prefer they get all theirs first. which leads to back room deals and selling your soul to mark zuckerberg
As others have stated you can sell off your excess for full price and make even more coins, you can trade it to your NH. (I know I tend to give my extras to my NH before I advertise em of course I'm one of those greedy types.) or give in and pick up your key to the back room den of trades (kik).
Oh almost forgot. You can also pay 8 diamonds per expansion piece to get those last few you need. That would always be an option. It's less than 1 extra derby task
Oh and I want what ever bug sparkly has so I can have even drops too. lucky rat. (even though I'm faily sure it's just a fluke)