Cheap and Cheerful Smart light bulbs?

Hardware
1

i am looking for bayonet and GU10 bulbs.

I have RF switches, they can not report their state to HA so i was thinking if i could get some cheap smart bulbs that are controlled locally i could use the “unavailable” state to detect if they have been turned off at the wall.

2

What about some smart switch that can report to HA like Sonoff? Otherwise IKEA has some pretty cheap smart bulbs that integrate with HA.

3

I’m in the UK with no neutral, so RF was the only option for switches. I’ll check out the IKEA lights, thanks

Edit IKEA only have Edison bulbs no bayonet, stupid Edison