Stateside, the big box stores like Lowe's or Home Depot carry chunks (hickory, apple, oak, cherry etc.) in 10lb bags for usually around $8. The chunks are mostly tennis ball sized, and 4 or 5 of them would be great mixed with lump charcoal in your UDS.
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Homemade trailer Roaster a.k.a "Hog-A-Nator"; UDS; Dual Chamber Charcoal; ECO Gasser
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