Which is very surprising, typically short range missiles are cheaper. Apparently AIM-9X has gone through recent face-lift that still affects prices.
Su-22 is harder to find, but comparable aircraft SEPECAT jaguar goes for about 8 million.
an AIM120C is 300-400k
an AIM120D is 1.7M (I think it was listed as 1.2M last I checked this page)
According to this http://www.f-16.net/f-16_armament_article1.html a sidewinder in 1999 had a unit cost of 55k-85k which would be 9L,M, or P most likely. 9X did enter service until 2003
These toys, much like the planes carrying them get progressively more expensive in newer version.
But the cost ratio stay much the same. You get 4-6 AIM-9 for the cost of one AIM 120