Robb,
I often use oak molding (moulding, if in Canada) trim pieces. I own a construction company so its easy to come by. If you know someone who builds cabinets or does finish work ask them for their trimmings. Do not use any trim pieces that have had any stain, sealer or other chemicals applied. You could also visit your local builder supply store and buy a 3/4" x 6" Red Oak board, cut into whatever lengths you prefer and smoke away.
Shannon