STM has other MCU's that come with boot-over-can capability, here's a table to compare price, size, etc.
...
Verdict: Past STM32F1 they become super bulky and expensive! We probably won't need such expensive chips...
Evaluation Board
STM32F105xx: they don't have any eval boards on Digikey.
STM32F107xx: The cheapest I currently found:
- MIKROE-1103: $35