From the Name.com blog:
How does it work?
Well it’s really pretty simple, thousands of great names drop and are available for registration starting at 2pm EST, 12:00pm MST, and as time goes by the price gets cheaper. This is happening every day till the end of August. Stay on your toes though, or else someone might grab the name you’re eyeing first.
Here are the times and prices for the Happy Hour. All times are in MST:
Time COM price NET price
12 – 2:59 pm $9.99 $9.99
3 – 4:59 pm $9.65 $9.34
5 – 6:59 pm $8.65 $8.84
7 – 8:59 pm $7.65 $8.34
9 -10:59 pm $6.65 $7.84