They're pretty much the last man standing from the old-school electronics shops and I used to like trawling through the clearance area when they were at Renver Rd.
Yes, same, back when I lived in Melb, got all sorts of amazing things from the Renver Rd warehouse. I still buy from Rockby regularly as they are just about the last mob I know of that gets surplus components and moves them on at excellent prices, at least in their sales. I buy a bit of stuff that way for my own shop. Plus, their shipping is fast and well priced.
As for Oatley, looks like their site is gone or going, is giving a certificate error now, so they are pretty much done. Hopefully, Rockby will keep going for a while yet.