I got 2 1000l flow bins for R250 about a year ago. Now you are lucky if you get 1 for less than R1000!! I now use them for grey water storage to flush loo's and to water the 3 plants we have left in the garden.
Then I also have a 2500l JoJo for rainwater which we use for the washing machine. We are still on potable for washing dishes and showering, but that will change soon, when we get more rain.
I would rather use a JoJo as they are blacked out which will prevent algae growth in your rainwater turning it green and smelly. The water in my flow bins are getting very green, especially when it is hot outside, but every now and then I pour in some "Tank Pong" which clears up the algae and makes the water smell soapy. It is biodegradable and safe to use in the garden. At the same time the water in my JoJo stays crystal clear.
Once the winter sets in and the frenzy is over I will invest in more JoJos to get us completely off the grid. The current pricing is not sustainable.
PS on the other side, the way CoCT is going on with moving Day Zero back every 2 daye I might consider selling my tanks as it seems Day Zero will never happen??
