The Neo-6M based module (Crius CN-06) is available from HobbyKing for $20
(sometimes on sale for $16). You do have to add the wire to access the 1PPS
signal.
In my testing, I prefer it over the Adafruit Ultimate GPS. The Neo-6M seemed
to a a little more sensitive (could get reliable lock and tracking sitting on
the floor of a 2 story stucco house (stucco over wire mesh) away from any
windows and did not have issues with reporting fixes of a rather stationary
antenna - the Adafruit module would fake a fixed position if it was not
moving). I did a little testing of the 1PPS output and it seemed to be quite
good.
My application was mainly driven by the desire to calculate the range and
bearing between two units spaced 100 feet to a couple of miles (using an Xbee
radio link). I could move a unit in a circle a couple of feet radius around
another one and get good range/bearing info... not too shabby for a $20 hockey
puck.
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