You don't have to go to a store to get science and educational toys. Some of the best science toys are the ones you can make yourself using common household materials. Here are some easy and fun science toys to try.
This is the safe, non-toxic version of a lava lamp. It's a toy, not a lamp. You can recharge the 'lava' to activate the lava flow again and again.
Despite having the word 'cannon' in the name, this is a very safe science toy. Smoke ring cannons shoots smoke rings or colored water rings, depending on whether you use them in air or water.
Make your own polymer bouncy ball. You can vary the proportions of the ingredients to change the properties of the ball.
Slime is a fun science toy. Make slime to gain hands-on experience with polymer or just hands-on experience with gooey ooze.
Flubber is similar to slime except it is less sticky and fluid. This is a fun science toy you can make that you can store in a baggie to use again and again.
You can examine how fluids behave by building your own wave tank. All you need are common household ingredients.
The ketchup packet diver is a fun toy that can be used to illustrate density, buoyancy, and some of the principles of liquids and gases.