Ended up ordering this and while I was at it I got 20 x 8g 62% Boveda packs. Have decided against freezing, will rather use these humidity control packs to keep it fresh (in glass jars of course).
PS: there is a R50 off on your first order if you sign up to the newsletter...
Thanks for the offer. The one Nibiru linked to is R200 and delivery is only R45 it seems. So not much.
This is tempting, apparently will work with my Android phone too.