Nat Geo TOPO! Explorer SuperQuads 1/2 off

I don't know how many others have this program, but I went to get a few more quads and noticed that they're on sale for $.50 per credit (rather than $1.00) until January 3.

I'm not that impressed with the software, but since I'm still using it, $.50 is still better than $1.00 and I plan to stock up.