I have never in my life seen pawls available for sale separately. As mentioned above, freewheels seldom get disassembled - they are usually replaced as the cost for the parts + the effort required to deal with all those tiny balls simply means repairs are not worth the time and effort. THe last freewheel I bought was less than $10 - and yes that is a complete working freewheel with pawls inside.

Are you just trying to rebuild that freewheel or do you have some other project in mind for which you need extra pawls? If so, buying multiple $8 freewheels and stripping them for parts is likely much more cost effective than sourcing and buying loose pawls.