Dave,
Fairchild has a nice little high side driver that looks perfect for your application.
Spec'ed to run at 3.3V, drops .3V at 1A with 3.3V signal on the input
(it'll work with 3V), - needs one resistor for turn off.
Integrated with large P channel FET on the high side with a low power N
chan Fet for level shifting and with a couple of protection diodes here
and there.
$.22 ea @ 1K pcs.
pn  FDC6323L Integrated Load Switch
http://www.fairchildsemi.com

Hook Vin to 3.3V supply, drive On/Off with 3.3V, 1MegOhm from Vin to
high gate for turn off, and the load goes between Vout and ground.

Seems good to me but note that I have not tried them. I bet you could
parallel them for less drop. Oh, also note that they are SuperSOT-6
package  (read as small surface mount device)
For general interest, these high side drivers come in different ratings.
$.32 gets you .1V at 2.5A with 2.5V drive



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