STM has other MCU's that come with boot-over-can capability, here's a table to compare price, size, etc.
This application note lists out all the ones that have this capability.
Supporting Models:
STM32F105xx,
STM32F107xx
Chip
| Part | Price | Size (mm) | Flash Size | Peripherals |
|---|---|---|---|---|
| STM32F105RBT6 | $9.15000 | 10x10 | 128k | |
| STM32F105VBH6 | $9.59000 | 10x10 | 128k | |
| STM32F072CBT6 (MS 12 MCU) | $5.39000 | 7x7 | 128k |