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Around here in SE PA, we have Orchards all over the place, with stores & fruit stands nearby. Some of them sell trimmings & logs from old trees they cut down. Some just give it away to get rid of it.
Other than that---Our Home Depot sells some species of chips & chunks.
I'm down in Cincinnati, and I found some of my wood from Craigslist. I found one guy who had cherry wood and another who was selling a bunch of red oak (this was earlier in the year). I would suggest scanning Craigslist for folks who are selling firewood and are calling-out what type of wood it is. A lot of folks just sell firewood and it is a mix of a bunch of stuff, but if you search for something like "Cherry Firewood" or "Oak Firewood" or even better "Hickory Firewood" you may get lucky.