For 50 on steam. I can gift you anything on steam for 50 or if you wanna buy weapons on CSGO for it.
Here's the battlechest for 49.
To clarify. I only need:
Diablo 3 Key (EU)
Diablo 3 RoS key (EU)
To make this a little more than just a simple trade, I'll give you 59 steam credit for the 50 D3 Chest.