Sulphurous is a refreshing effect.

Sale 1

Sold for 50 keys

http://backpack.tf/profiles/76561198100269264#!/compare/1472342400/1472947200

http://www.tf2outpost.com/trade/28417262 ----- B/O was 50 keys, took ~2 weeks to sell.

=======> 50 keys

======================================================

Sale 2

Sold for an Orbiting Fire Tree (24 at the time) + 27 keys

http://backpack.tf/profiles/76561198120147285#!/compare/1469491200/1469577600

No Outpost trade

=======> 51 keys

======================================================

Sellers

- No sellers at the time.

Summary

- Sales for 50, 51.

I will round the highest sale and go with 50 keys flat. Criticism appreciated!