Unless you live in a rural community or have family that does, it can sometimes be difficult to find a source for bbq smoking woods.
The next time you're looking for a new source of some of the harder to find woods for bbq, check out Barbecuewood.com . They appear to have ample supplies of apple, alder, pecan, hickory, white oak, orange, peach, pear, and maple. Hold on to your pocket though and brace yourself for the price.
As I've always said, bbq is not for the faint of heart, faint of mind, or folks who are on a very tight budget. The shipping costs for wood will eat you up if you have to buy your wood for an offset like a Lang or Horizon.
For most folks that don't have access to a readily available or economically feasible supply of bbq wood it's probably best to stick to charcoal burning cookers and then add chunks of your favorite wood for smoke favor.
Another alternative is to find someone locally that sells firewood and then cut it into chunks your self as you need it. A pickup load will last a long time and save you a bundle in shipping expenses.