ReMean use the trading channel on discord for this. I believe the purchases thread is for irl deals only
You can ask for trades over the forums, just use the Trading category of GTM. I have moved this thread from Purchases to GTM, under Trading. You may also use the GTM discord to post your trades, just make sure to read the pinned message and follow the rules! https://discord.gg/Gd5nH4P