if you can find a cheap Vino, grab it... you wont regret it.
That being said, I would suggest that your first humidor be at least TWICE as big as you think you will need. That way it will only take you two monts to fill up instead of one

no, but seriously, buy bigger.
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"One fart can foul the air for everyone" - Esteemed philosopher
"If avoiding the nasty $hit is being a snob, them I am guilty as charged."- Same esteemed philosopher.