www.dota2wiki.com/wiki/Golden_Baby_Roshan
Current price according to http://dota2prices.com/couriers/ - 1600-2400 keys (1key = 2.5$)
Price : 32BTC
32 BTC? Nice one. I can sell the normal one for 16 BTC: http://steamcommunity.com/profiles/76561198036801189/inventory/
Please get knowledge before you post.
Current price of Golden baby roshan can go up to 5k $.