Sorry, this is a bit off-topic as it’s a plan in a physical store, but you probably have an IKEA near you. I also specify that promotions may vary from store to store… In short:
-50% on all equipment in the Tradfri range. Verified at the IKEA in Pacé, near Rennes (35).
=> until stock runs out
This makes the white Zigbee dimmable bulb 5€ and the colors 10€!
If you haven’t heard of these products: HERE