Looks like a d/b/a will be the hot Christmas gift this year.
It only costs about $300 to register a Delaware LLC.
Yearly maintenance costs and some states require you to also file as a foreign corporation doing business in the state.
$99 to register an LLC in Ohio and it takes about 15 minutes online through their website. Free to get a federal EIN.
IIRC - Once you file for an EIN then you also have to file state sales tax returns, even if sales are $0.
With a single member LLC it is just an extra form on your personal return at least!