Readily available at area sporting goods stores and online such as Gander Mountain, Tannerite is readily available for purchase in Ohio.
Things get sticky if you actually use it.
Recently in Geauga County, Ohio a case of reported explosions coming from a house uncovered the man admitted to setting off four pounds of tannerite off at a time.
Tannernite is inert until its two parts are mixed, and then only can be detonated using a high caliber weapon.
Here is a video of some shooters enjoying four pounds of tannerite at a time.
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This article contains the link of the official Ohio laws pertaining to setting off products like tannerite in the state of Ohio.
If you own tannernite and plan on setting it off in Ohio, there may be a police presence at your location quickly now that this law is well known. Be careful out there and be responsible.