You can get Grimstroke items for free in the . The fastest way is opening — noticeably cheaper than buying on the market.
The cheapest Grimstroke item costs $0.03. Prices update based on the Steam market.
The DotaLoot database has 47 items for Grimstroke, prices from $0.03. Rarities: Rare, Mythical, 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.