The other grandparents of my grandson bought him a fantastic activity walker. It was so solid, made of wood, and so many activities. I think they got it from KMart.

Make your own!
Buy a basic cart that suits what you want & fill it with your own bits & pieces you can buy from most cheap shops or in bulk online.
Ebay is a great source.

Toys R us…and even Target gives a good variety

I’m not really sure what you mean by an activity cart. I bought a plastic walker from Target that has removable, coloured shapes, a little keyboard, a squeaky button, a turning rattle, abacus beads and a noisy crank. My girl uses it quite a bit and it was quite cheap.

You’ll find a few different brands and designs on eBay. It’s where I find most things!

yeah i would just check out ebay or even those discount sites as they always have this sort of thing.

I buy a lot of toy and clothes off EBay, aliexpress, deals direct or oo.com.au and myer online . You could try going to the local markets which are on the weekends.

Melissa and Doug brand are very good. We hired one from the local library

I know Amazon sell them you just have to find a seller that will post to Australia. I have noticed more wooded toy shop popping up around. Have you tried some of these. If your in Melbourne I know there is a few around.