NGC posted about some fake 1928 SA Sovs a while back for people records:
https://www.ngccoin.com/news/article/5626/counterfeit-1928-south-africa-gold-soveriegn/
No idea on the coin @AtlasNumismaticshowever I must say you have some cracking coins but generally find you way over priced on your British stuff, in the main, unfortunately for me!
No its still £99 to join but you get that back as a voucher to spe d at auction and on grading. Well worth it imo for access the the images and population info.
Not quiet ebay but facebook does chuck up the odd bargain. Less so now but 2 to 3 years back they did appear fairly often. This was one of my best buys off there via an auction.