I have a farm in Ohio so I hunt it a lot. There are no point restrictions in Ohio so you can kill what ever you want, and yes you can buy a tag at the check station as long as they are a license issuing agent. The cost for a tag is still the same amount unless you hunt in an urban zone. When I buy a license online all I do is take a piece of paper and fill it out like a tag would look, when I shoot a deer I fill it out and take it to the check station with me. The best thing to do is read the regulations or get on the ODNR website.