30% off All Travel SIMs (Bali, Japan, China, Europe, USA, Global) from A$2.80 @ TravelKon

Used TravelKon a few times now never had any issues.
Japan Sims are quite competitive with both local and 3HK equivalent ones.

Missed the 50% off deal on Monday but it only looks relevant if you were travelling to more than one country

Full list of pricing on OZB
https://www.ozbargain.com.au/node/947185