Credit to the OP from deal https://www.ozbargain.com.au/node/706139
The price of a 3 month code seems to have gone down since original post. Total cost comes up much cheaper.
I've copied the following instructions from the original post.
- Purchase 8 codes
- Redeem code on http://redeem.microsoft.com/ or your xbox
- Enroll for auto renewal to get one extra month
- Turn off auto renew
- Repeat 7 more times
- Purchase Game Pass for $1 or $15.95(whichever is applicable to you) from https://www.xbox.com/en-AU/xbox-game-pass
New User:
(8 x 7.92)+ 5.4 + 1= 63.36+5.4+1= $69.76 ($ 1.99 per month for 35 months - new users will get 3 months added during step 6)
Lapsed User:
(8 x 7.92)+ 5.4+15.95= 63.36+5.4+15.95= $84.71 ($2.56 per month for 33 months - lapsed users will only get 1 month added during step 6)