In marketing, products are separated into three major categories: convenience, shopping and specialty products. Convenience goods are inexpensive items that are frequently purchased, such as milk and eggs. Shopping goods are higher-priced items that consumers typically comparison shop for, such as refrigerators and washing machines. Specialty products are products not purchased on a regular basis and consumers do extensive research before purchasing these items. Specialty products are typically expensive are unique in nature-meaning not easily substituted.