Not sure why it took me this long to realize I can make dried, ground ginger at home. It's a totally different spice than the one bought at the store. As well as packing a good amount of heat and flavour, the home ground ginger also has a lovely citrus overtone in the aroma.
Here's the link:
The only thing I did differently is use a home dehydrator, set on low, for about 7 hours to dry the thinly sliced ginger.