Where did you see 3.49? I see about $2.30 for the DIP, and $1.60 for Qfn or lqfp.
But yeah, they’re just barely competitive with the low end cm0 chips...
I wonder why the stm32f0xx chips haven’t shown up in any popular hobbyist form, yet...
It was a Google search for Mouser and ATmega4809 in 40 pin DIP from Australia, and the price was taken from the Mouser web site. I think they add extra for OZ. I should have stated $AUD, apologies.
Perhaps stm32f0xx were never popular with hobbyists because Arduino is a Atmel shop ?
Plus the ST free software development collection was a nightmare of broken complexity. I remember trying to create a Blinky with it in 2014 and failed utterly. I didn't remember C being that hard and complex after a 10 year hiatus from embedded. It was enough to drive a person to Forth!
So STM32F0xx is hard, Arduino easy, it's a no brainer to see where hobbyists were attracted and why.
Of course that bloody $2 "Blue Pill" had to get Arduinoized (to a degree), so hobbyists went straight to the old STM32F103 Cortex-M3, bypassing the much newer Cortex-M0 completely.
Loosely related, but interesting:
Now we have a new player that's going to cause quite a stir in the hobby market I think. It's a RISC-V core with STM32F103 peripherals. It's fast (108 MHz with zero Flash wait states !), cheap and fully open. It's the Chinese GD32VF103C. See this link for datasheets:
http://dl.sipeed.com/LONGAN/Nano/DOC/How long before Arduino caters for the GD32VF103C do you think, tomorrow, a week, two weeks ?
The Mecrisp-Stellaris creator, Matthias Koch already has separate releases for the Risc-V and the STM32F103 so it won't take long for him to include the GD32VF103C in his supported hardware list. He has some of the LONGAN Nano units in the post to him already.