The core runs from a 1.235 V to 1.365 V supply, which is a low-voltage rail — you will need a dedicated regulator, not the common 3.3 V or 1.8 V LDO.
1.235 V–1.365 V core — the supply-rail constraint
The core supply of 1.235 V to 1.365 V is tighter and lower than the typical 1.8 V or 3.3 V used by most Cortex-M3 parts. This means the board needs a precision low-voltage regulator, and the tolerance band is narrow — a standard 1.25 V fixed LDO with ±2% accuracy will work, but a 1.2 V rail with ±5% could drift out of spec across temperature. Budget for a dedicated rail; do not tap a shared 1.2 V supply without checking the load regulation.
For BOM lines already in production, the only viable channel is the surplus and broker market.