HLP has it nailed. They are all for the most part common. Accept for the "war wounded." Not as common - but can still be found.
DRA, DRL, SA variants - 1,2, and 3. The SA variants are denoted by serial number placement on the first two and no serial number on the last variant.
And yes - 1 post war I got for free one day
The only ones that are not common are low serial numbered first edition SAs. That's my opinion though. Yes - the badges can be found in very good condition