OK, not the best selection but a couple options.
https://www.evetech.co.za/corsair-rm750x-750w-power-supply/best-deal/4451.aspx
Very good PSU, but a bit more than you need to be honest. Not that that is a bad thing, other than the added cost.
Probably the better value for money option would be the Antec EAG. Good but not great, but half the price. 550W would be enough, but the 650W doesn't cost much more if you want to go for that.
Edit: And of course they're sold out of all of the Antecs. Another relatively cheap alternative is the CX650 (non-M). The non modular versions are actually better PSUs that the modular version you originally wanted to buy.