@Gemma I got a few good deals in their sales, got some on eBay second hand and then family gifts. Definitely recommend looking on eBay for bundles!
@Sarah thank you I'll have a look. I've got a few on vinted but don't tend to be much cheaper.
Love this idea. Our son's only 2 and had his since Christmas so don't quite have enough to do this with yet but now I feel the need to buy more just to sort them 😅🥰