I have one self built and it cost about $200 for everything. Dual band with GPS. Highly recommended, it works well in my location (Miami) and I use it with foreflight. Here is the website for more info:

http://www.stratux.me/

Try www.3dhubs.com they should be cheaper (significantly) than UPS store.

WAG, since about Aug/Sep 2015. I first read about just before Turkey day, but didn't build until RPi3 and the GPS code was stable with the adoption of the VK172 last month.

AMNegron - have you had good luck with the vk172?

Open flight solutions posted recently that the VK172 has been a "marginal performer" and now recommend a USB remote mount gps antenna.

https://www.openflightsolutions.com/category/blog-post/

Yes. When the unit has a clear view, quick lock-ons and typically under 5m accuracy (on the glare shield). When moved to a side window, accuracy drops to about 10-15m. At times as many as 15+ satellites tracked.

Read far enough down in any of the forums/sites, every component has issues. The best part of this is that YOU build whichever form you need or desire...don't let OpenFlightSolutions dictate your needs.

@AMNegron - Steve from Open Flight Solutions. here. To explain: I've bought about 1000 VK-172 GPS modules and I've rejected or replaced close to 100. We've also found that it is extremely sensitive to voltage issues - either under-volt or voltage fluctuation. If you're using it with the Pi 3 that can pose a problem.

When it works, the VK-172 is a good GPS, but between the quality variation and the voltage sensitivity it causes enough issues that I don't want to base my reputation and business on it. So we now offer several options: go with no GPS if your table has a good GPS; go with the remote GPS if you need a very solid GPS; go with the VK-172 (available as an optional accessory) if you want to save space - just be aware of the potential issues.

I hope that all makes sense. Thanks!

Steve

I picked up a VK-162GPS off Amazon, $18.99. Unfortunately they are showing out of stock right now with no ETA. Here's what I get, this is in a 172 with the GPS mounted at the top of the windshield: