Light bulbs for microwave and oven and fridge + where to buy from?

[OM2]

We have a Samsung microwave.
I wanted to get an LED bulb.
I read up it was safe inside a microwave - as the bulb sits protected.
I can't find ANY LED bulbs.
(I did find one single one on Amazon, I bought, but that was straight connectors, when I opened up, I found to be angled connectors.)
Am I missing something? No LED bulbs available for microwaves?

Oven: I inspected the current bulb. It's a G4 bulb. Will ANY G4 do, or do I need one that stands up to high heat? (I've read the you do NOT use an LED bulb for ovens.)

Fridge: we have a missing light bulb + cover for the light.
It's impossible to see what bulb fitting is needed. What should I try first?
The cover... it looks as though it's cone shaped and has slits - does that help indicate what bulb I need?

+ Where do I buy from?
Ideally I want to avoid Amazon and ebay and buy from a shop I know - like Screwfix or Toolstation say for example. I can't find any names I know. I will end up buying the same item I get on ebay or Amazon. Any ideas?

(I buy all the time from ebay and Amazon - but for things like smoke alarms, lightbulbs, electrical fittings... I avoid to be safe.)

Thanks.

 

[SFK]

For oven and fridge spares try these as examples:

www.tdspares.com
www.espares.co.uk

And others
https://www.google.com/search?q=oven+spares&oq=oven+spares

 

[foxhole]

Fridge and oven bulbs have to be resistant to the temp variations.