Return current on Adafruit GPS
Via-in-pad costs more to do it right.  

You can't just drop a via in a pad and expect it to solder properly in production without taking precautions, since the solder paste which should be on the pad tends to get sucked down into the via hole during reflow instead of staying on the pad where it belongs.  

You can have the via hole filled, either with a copper plug or with something else which is then plated over to produce a nice solid flat pad.