We found this guy: Jason Demaine @ Reptiles & Crickets Tel: (011) 915 0847
Tel / Fax: 011 915 0846
Cell: 076 825 3346
Webpage: http://www.reptilesandcrickets.co.za/
He has great prices and sells wholesale to the public as well as to pet stores. We are super impressed with the quality of his products - his cricks last twice as long as we're used to, no buying dead crickets anymore! They are based in Brakpan/Boksburg.
For roaches, I will definitely recommend http://www.saroachman.co.za/. He has some great specials on roaches and his service and product are top class!