Simplify the following text for a Grade 6 native English-speaking person.
Original: The product line-up currently consists of the hard drive-based iPod Classic , the touchscreen iPod Touch , the compact iPod Nano , and the ultra-compact iPod Shuffle .
Simplified: Another type of iPod , called the iPod shuffle , is very small , and it uses flash memory , like the iPod nano but it has no screen . It is the least expensive iPod .