Melamine side plates (DA1)

Hello. My mum has broken all her side plates and I need to find some of the type you use for picnics that don't break. I've checked all the local charity shops, and they seem to only come as a whole package online. I only need a couple so she can use them for toast or sandwich, the carers will carry the big plates to the table for dinner but she likes to have a snack too and always drops the little plates (she's broken her cups too but will only use china ones but I can always find them in the charity shops, just can't seem to find any of these unbreakable plates) Thanks