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You don't need dew caps on a dob. Eyepieces and finder are the main things affected and sometimes the secondary.
For the finder get an old stubby holder, rip the bottom out of it and slip that over the end which will protect the objective from the worst of the dew.
I did a lot of observing before getting dew heaters, just had a cheap hair dryer on hand with an extension cord and used it whenever needed, saves many $$ until you do decide to commit fully to the hobby.
Use money saved to get the best scope as Poita suggests. And 10" always beats 8"!
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