Note: this will only work if you have the expansion pack, The Sims Makin' Magic

When you have 1000 or 1500 magicoins, move your family into a Creepy Hollow lot (I don't know if it works on a regular neighbourhood house). A Creepy Hollow lot is in Magic Town. Keep casting lots of spells and you may get some of the following: Magic Toadstools, A Magic Beanstalk, Gnawed Roots and Magic Crystals. Magic Crystals are really good. You can learn Spook, Hand Buzzer, Fire extinguisher and about 5 more.