Mrak

I'm just getting a "little" grasp on everything and I'm hoping for some advice. I'm going to start on a wood gear clock and I've been looking for Grade B plywood "Birch" because it's the cheapest. I've been shopping around to find the best value on the different websites and wondered if anyone out there had a favorite place that they liked shopping at. Also: Is there any reason why the plywood should be used instead of buying some solid wood, say from homedepot for example. I've always used the plywood in the past when I attempted to make wood gears, but I wondered about using just plain solid wood from the inexpensive boards from the lumber shelves. Thanks for any response. Mark