Hi Leeann,
Even though I have so many polymer notes (world wide) in my collection, I must say that I only have few of them with radar serial numbers. It's not that I can't buy them, but somehow, one has to look at what kind of radar numbers first before paying a high premium for the note. The one you have is nice, and I think I have one (the best in my collection) is with serial 077770 (2001 Australia $5 Federation note). Unfortunately this is not the first prefix AA note.
I am aware that there are many radar notes collectors, even in Australia, but to me unless the number is nice or perhaps unique, it is not worth paying a high price for it. Of course, some radar numbers are most sought after by collectors and to me, numbers like 123321, 100001, 0001000 and others. I believe I have more repeaters (001 001) that radar notes, unfortunately these repeaters are worth less as compared to radar notes.