A good LGS will find you what you want pretty fast. The SA mil spec should not be a problem to find at all and around $700-800 if I remember correctly. Give them a couple of weeks to find you one and if not see if they will refund your deposit and try another LGS.
Between the two I like the SA better for a couple of reasons, but that is just my opinion.
Don't question my right to own a gun and I won't question your stupidity not to.
You give Peace a chance, we will cover you if it doesn't work out.