The DotaLoot database has 64 items for Primal Beast, prices from $0.11. Rarities: Rare, Mythical, Legendary, Immortal. Any of them can be won from DotaLoot cases or claimed for free in the daily giveaways — noticeably cheaper than buying on the market.
You can get Primal Beast items for free in the daily DotaLoot giveaways. The fastest way is opening cases — noticeably cheaper than buying on the market.
The cheapest Primal Beast item costs $0.11. Prices update based on the Steam market.