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Jen,
I second the DewNot heaters. Well made and very servicable. I've got 7 or 8 in different sizes and wouldn't look at any other brand.
I've purchased all of mine either from Agena (directly or via their ebay account) as well as ScopeStuff. Would recommend both of these companies and shipping from US usually pretty quick - less than 2 weeks.
As Erick's mentioned, dew heaters for your eyepiece and secondary are easily attached and used, but nor sure about a dew heater for your primary. In a dob, that's usually accomplished by fans .... but other will chime in with a bit more expertise than me.
Paul
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