Was checking the rarely used Switch Online app and noticed that there was a 10% back in Gold Coins. Seems pretty good when combining with any 10-15% eShop cards saved up in the past.
Note that this is for New, Extend and Renewing memberships.
- Receive AU $3.00/NZ $3.30 worth of Gold Points when you purchase or renew a 12-month Nintendo Switch Online Individual Membership.
- Receive AU $5.50/NZ $6.05 worth of Gold Points when you purchase or renew a 12-month Nintendo Switch Online Family Membership.
Note that Gold Coins can only be used in the Switch eShop.
Check link for more information.
Looks like you can stack these / extend your subscription.