Where can I sell my FreeNAS build quickly?

Hi everyone,
I am relocating and the international shipping is very expensive. Where can I sell my FreeNAS build quickly? I need to sell it within next few days.

I am uncertain about its chances to be sold within few days on eBay. FreeNAS forums doesn't have a marketplace, but selling a custom build like this is best suited for a savvy audience like the one here.

What are my options?

Thanks for your time.