cheapest place on the East Rand to buy test kits

Hi guys

Wonder if anyone can assist.

I always get my water tested at my lfs but it's a shlep, because if something goes wrong in your tanks, you want to know what it is, immediately...
You don't always want to wait before you can go to your lfs to get your water tested, and in the meanwhile your fish are getting sick, and i also think i's just good practice to test your water frequently...

So if you know where the cheapest place is, and cheapest, but reliable test kits are sold, please let me know?

And for how much they are going for, all my tanks are very stable, now, except my 5 ft