The LFS in Centerville, Centerville Aquariums or something like that, had CPDs when I was there a long time ago but they were asking about $9 for them too. They also had a tank for Red Cherry Shrimp (they were out of stock) and were asking $4 or $5 a pop for that.
Pretty wild :/
The Petco in Burke usually carries some Discus and a few other neat fish like the Black Ghost Knifefish and Elephantnose. In my experience though the Petsmart in Fair Lakes or Springfield tend to have a better selection of fish although rarely anything out of the ordinary. Petsmart in springfield did have some White Cloud MM (as of 2 days ago) although they didn't seem to be that great of stock.