[AZ-Observing] Need a pointer please

I have been unsuccessful in my search to buy a 1.5µF 20V Tantalum electrolytic 
capacitor in the Valley.  I have tried the usual suspects (Radio Shack, Fry's) 
to no avail, and my Google searches have not been fruitful. 

Does anyone know of a business in the valley that might sell such a component?

The capacitor is a critical part in a PWM (pulse width modulator) circuit that 
I am building to efficiently supply juice to a dew heater strip.  The things we 
do to keep ourselves occupied astronomy wise when the skies are bad.

Thanks.

Bob

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