If you are in Australia, I found these food grade tubes at Bunnings.
This one i bought was 25mm diameter by 90cm long and fits perfectly over the Flow Hive tubes. It is probably enough for 2 or 3 tubes to a bucket from the frame. There is also a longer one.
I also got a 5L food grade bucket there (link) but you can probably get these at your local bee keeping store too.
