This document summarizes different types of computer systems including their average costs. It discusses desktop computers from major manufacturers like Apple, Dell, HP, and Lenovo ranging from $279 to $1,899. Laptop computers average $2500, smartphones from Blackberry, Apple and Nokia range from $250 to $499, and tablet computers average $1400. Touch screen computers are $1,184 to $1,522 on average, Apple computers average $1850, Surface computers up to $10,000, GPS systems average $650, and mini laptops range from $300 to $900.