You can buy styrofoam at Michaels craft stores.
Homebase any diy shops
No, they do not.
Styrofoam has many uses, mainly in the building industry. It is formed in large sheets and blocks of various thicknesses and densities as an insulator
Orvis.com sells Styrofoam beads for dog beds. $6.00 a bag.
It's probably not the best use for styrofoam because it wouldn't be too strong in the shape of a keyring. It has better uses when it is in big blocks.
You can get Styrofoam balls from any craft store. Check Michaels craft store.
You can buy a foam cutter for thick styrofoam here: http://www.uline.com/BL_505/Foam-Hot-Knife?pricode=WO230&gclid=CP_EwaKiwKACFYk55wod0HpzUQ
You can probably buy them at Micheals or any other craft store.
Modelling clay plaster of paris sanded grout or concrete (most expensive) carve blocks of styrofoam
One can purchase cheap Styrofoam sheets in both local bookstore and online stores such as the following; Shop Hobby Lobby, with very affordable prices ranging from 3. 99 USD to 9. 99 USD. Home depot and eBay also are the best place to buy inexpensive Styrofoam.
Styrofoam balls (including larger-sized ones) can be found in stores that sell craft supplies, including:WalmartMichaels Arts & CraftsDollarama and other dollar storesDeserres
styrofoam is cool
You can recycle the coffee cups as long as they are paper and not Styrofoam. Paper is biodegradable as were Styrofoam is not. So go for it. You can also buy recycled coffee filters.