dont forget for 1 ic = 27$ for
1000S =13$

this is expencive but dont forget
internal 8 chanel 12bit 100k Adc = 10$
2 chanel 12bit dacvoltage = 6$
internal osc = 1$
on chip debugger and internal programer
ultra high speed 20mhz cpu = 7$
+smbus +spi +pca +wachdog +8 chanel reset source(better using ad695) = 3$
and 32kb in system programble flash
and pin congigurable !
it real system on chip,i think it very
low cost !