The rule for any con is, check their policies. Also check the rates for dealers, you may be pleasantly surprised. There might also be an artist's alley where you can sell crafts too. Those usually involve renting a table but it's much cheaper than a dealer table.
Yeah, the only other way to sell things at Ohayocon without being a vendor is to apply for an artists alley table.
Check out Ohayocon's forums and site for further info on applying.
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