You can get Monkey King items for free in the . The fastest way is opening — noticeably cheaper than buying on the market.
The cheapest Monkey King item costs $0.03. Prices update based on the Steam market.
The DotaLoot database has 116 items for Monkey King, prices from $0.03. Rarities: Rare, Mythical, Legendary, Immortal, Arcana. Any of them can be won from DotaLoot cases or claimed for free in the daily giveaways — noticeably cheaper than buying on the market.