Selling 3 Cave Spider Spawners

[Wone]

I'm selling 3 cave spider spawners relatively close to each other (you can stand in the middle of them 3 and still be within spawning range)
I cleared out a little bit of the area, msg me ingame or mail me on the forum if you want to view it yourself.
I'm gonna put it on auction:

Starting price: 5k
Price increase per bid: 1k
Buyout price: 20k

The auction ends in 14 days after this post.
Happy bidding!

[Afro_]

What world is this in?