Cheapest I've seen it (including the Amazon deal that I posted that disappeared in less than 5 minutes!)
Also cheaper than the current JB Hi Fi deal ($29) and the Big W double pack with Sonic Forces.
[Switch] Sonic Mania $18.86 (Was $26.95 30% off) @ AU Nintendo eShop
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60
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Good to combine with 10% off eshop cards at Big W.
Free on ps plus atm