Melissa & Doug Sticker/Activity/Colouring Pads $4.86 + Delivery ($0 with Prime/ $39 Spend) @ Amazon AU

Good sale on selected colouring/activity/sticker sets of Melissa and Doug whilst being a great time to make use of
12% Shopback plus $2 bonus https://www.ozbargain.com.au/node/515961

Here's a few more I found via this search

https://www.amazon.com.au/s?k=melissa+and+doug&i=toys&s=pric…

Melissa & Doug ABC 123 Wild Animals Dot-to-Dot Coloring Pad $7.25 https://www.amazon.com.au/gp/product/B01B1UAYKS
Melissa & Doug Seek & Find Sticker Pad - Adventure Sticker Sets & Activity Pads $5.39 https://www.amazon.com.au/gp/product/B07J6TPXHT (limited stock)

As far as my research goes they usually go for around $10

Note that the price keeps changing I ordered a few and they instantly jacked price before I posted them so be quick!