Try Macsteel jhb. U'll have to phone the directory for their number. You can also try VRN.In welkom they do our stainless and they are connected to macsteel. If u phone them dirctly as opposed to going through macsteel u'll probably get a beter price.
A mate of mine actually bought his from the scrap yard. They sometimes have offcuts that end up there. Stewards and Lloyds might also be able to help u.
Good luck. Phone me @ 083 633 1109 if u don't come right.