Amazon has "Columbine" for $7.50 (57% off)
My publisher seems to be experimenting with flash sales on Columbine.
It's currently $7.50 in paperback at Amazon, which is 57% off, way below the normal price as well as the cover price.
I have no idea how long. The kindle version went on sale for $3 (or $4?) a few weeks ago, but quickly returned to $12. They seem to be experimenting.)