You don't need to spend lots of money on children to have fun with them!
These photos show my 2 year old, but these sort of games have been fun for all my children at various ages.
Outside the op-shop they have "These things free" box. The other day I found a stainless steel teapot, and a little pottery jug.
This fun lasted ages! First we just used water, then I added some washing-up liquid for bubbly water. Now the teapot is in the sandpit for different games.
The good old cardboard box game! I made the door so small that only our toddler could crawl inside, but surprisingly his 9 year old brother managed to get in too. They both thought it was hilarious!