Before spending hundreds on a gas dryer, have you checked out tandem breakers? 
We use em when we need to add some space in a cramped panel. They also come as quad breakers for your 240 volt loads. So long as the panel itself isn't near the limits of it's ampacity you should be fine.
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83 - 944, daily driver
62 - VW Karmann Ghia, never moving restoration
"Oh Bother," said Pooh, as he chambered another round.
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