The mam dummies can be sterilised in the microwave in their case.
You can also boil them
Mam ones can go in the microwave x
I use Milton tablets in cold water
The tommee tippee ones come with a box you can sterilise them in the microwave with.. so I imagine other brands do too. I breastfeed but we have a UV steriliser as I also pump as she takes a bottle once a day so my husband does one of the feeds. But we also sterilise things in the microwave. My pump gets sterilised n microwave bags.
You could buy the Nuby UV dummy steriliser