Where to buy Grain Theory

Based in United States Ships from Portland, OR, USA · 3-7 days to you 13 products in stock

Portland brand co-founded in 2013 by Jake Wiens and Matthew Rice; its US-made GT2 drops the balance hole using a swooped base cup.

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16 of 68 models in stock · 12 new models in 90 days · 0 restocks in 30 days · as of Nov 1, 2026 See the numbers Hide

Grain Theory by the numbers, as of Nov 1, 2026

Grain Theory released 6 new models in the last 30 days. The latest, GT-3 USA SWORD - Maple, came out on Oct 30, 2026.
Over the last 90 days a Grain Theory model came back in stock about every 6 days. The latest restock was on Oct 1, 2026.
16 of the 68 models we track were in stock on Nov 1, 2026.
Most complete kendamas from Grain Theory are listed between $34.99 and $99.99, with a median of $63 (store prices in USD across 41 models).

Every model below links to the store that sells it: the brand's official store or the retailers that carry it. DAMA PIG holds no stock and uses no affiliate links.

How these numbers are made

Computed every night from our own price and stock history of every store we track, checked at least daily, so timings are accurate to about a day.

A model is one design: colorways count separately, while pack sizes, ken or tama only versions and wood options of the same design count once. A model sold by several stores counts once, under its maker.
A new model counts on the day its store first published it. Windows are rolling: "last 30 days" ends on the as-of date.
A restock is a sold-out listing coming back. Sellouts under an hour are ignored as noise, and a model restocked at two stores on the same day counts once.
In stock means at least one listing was available in our most recent check, within 3 days of the as-of date, at any store we track. Prices are store prices converted to USD.