Well, a second invoice for 7.99 (for the 4GB stick...) just came through on my order. Weird billing on newegg's end, but I'm not complaining. At 39.99, this package remains a screaming bargain. No wonder it sold out quickly.
You should read this thread. By the way, I have a mid 2010 iMac i7 2.93 and the G.Skill is doing an outstanding job thus far. This thread may also be helpful.