Get 9 to 14 games (depending how generous they are that month) per month to keep and access to other downloads like drm free games from a back catalog as well.
If you are already a member and have the games for December you can cancel and rejoin but you will be charged again for December, I did this and I have emailed Humble to see if I can get a refund on December as I already had the games but I haven't heard back yet.
*edit update: they responded by email and because I had December the first billing that I was charged immediately is for January or so I’m told, I don’t know if there is some way to check this but I’ll take humble’s word for it. So you can just cancel and resub no dramas.
Works out to about $7.92 + int transaction fee if you have one.
I already have a humble classic subscription which I think works out to be $18 AUD/month (roughly? It's been a while since I've paid that). Is it pain free to just setup another account with a different email and payment method (Card and PayPal) to utilise this deal, then just pause my original account for the next sixth months?