Piano: An acoustic piano is the preferred instrument. Students can properly practice and apply all the proper techniques and concepts at home that they have learned in lessons. If space is limited, a digital piano with 88 weighted keys will suffice. A keyboard is not the same as a digital piano, and practice on a keyboard will result in frustration and inability to practice correctly. It is not necessary to spend a fortune in order to get an instrument. Your instructor will be happy to recommend resources or assess a particular instrument.
Guitar/Ukulele: There are lots of wonderful acoustic guitars, beginner guitar packs, and beginner ukulele packs. These can be found through Amazon, Guitar Center, and any local music stores. Making a trip to your local music store will ensure correct sizing for your child. Your instructor will be happy to recommend resources or assess a particular instrument.
Violin/Viola: String instruments of this family should be rented during early instruction as the student grows in size. Violins and violas are measured to the student and can be done at your place of rental. Once the student is of high-school age, a higher-quality instrument can then be purchased if so desired.