http://www.ebay.com/itm/STM32F103C8T6-ARM-STM32-Minimum-Syst...
http://www.ebay.com/itm/Hot-Sold-New-STM32-ARM-Cortex-M3-Lea...
I'm not sure if it's the distributor's profit margins, counterfeit parts, yuan-to-dollar advantages, or what.
Probably a combination of all that and more.
I doubt the STM32F103 is a knockoff though.
And they cost over $3 here in the US even on reels of 2400 pieces.
At least with a genuine Arduino board you get something that works and is of a reasonable level of quality.
When you have your final product you can always make economies of scale.
I'm not sure if it's the distributor's profit margins, counterfeit parts, yuan-to-dollar advantages, or what.
Probably a combination of all that and more.
I doubt the STM32F103 is a knockoff though.
And they cost over $3 here in the US even on reels of 2400 pieces.