Cheapest Q-1000X: Qstarz BT-Q1000X Bluetooth Data Logger GPS Receiver (66 ch, 1-5Hz Update Rate, AGPS, 200,000 Waypoints)

I bought this to geo tag images for Aperture. It picks up satellites even in a building. I also have used it with MacENC chart plotter. It connected immediately with Bluetooth (cancel the bluetooth network setup screen - you don't need it).

I use gpsbabel (free) to transfer the data to my desktop like this (command line version):
./gpsbabel -t -w -i mtk,erase -f /dev/cu.QstarzGPS-SPPslave -o gpx -F ~/Desktop/out.gpx

To read from GPS (connected via Bluetooth) at terminal use:
screen /dev/tty.QstarzGPS-SPPslave
To end use CTRL-A CTRL-\

I didn't even bother with the included software. The only reason you need it is to change some parameters like the update frequency. I did try the BT747 software mentioned elsewhere although it's been improved so you don't need to do all that complicated stuff.Get more detail about Q-1000X: Qstarz BT-Q1000X Bluetooth Data Logger GPS Receiver (66 ch, 1-5Hz Update Rate, AGPS, 200,000 Waypoints).