Haven't played with missiles yet but I noticed this for public market:
Missiles 10 (on hand quantity) $1.315 (min sell price) $1.825 (max sell price)
However, there are currently 407.131 missiles on the market selling for $2.276 each. When I click to sell on PM the default price is also $2276. When I try selling, it won't let me put anything on for over $1825.
Report: You have purchased 1 Missiles from the market, this had a total cost of $2.276.
http://imgur.com/FyumV.png