FDN338 is nice and perhaps about as cheap as GOOD P channel 
FETs get.
YMMV


>> We're looking for a simple high-side switching FET. A 
>> 2N3906 would work, but
>> for this design it's preferable to leave out the base 
>> resistor. Is there a
>> transistor similar to the 2N7002, in terms of 
>> characteristics, and cost?

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