I would do it. I think the planks are more expensive because you're paying for extra processing (smaller cut size), packaging and marketing.

Here's an article on planks:
http://www.wisegeek.com/what-are-grilling-planks.htm

__________________
Chad
2013 Jeep Unlimited Rubicon
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL