Flyers are inexpensive to produce and they required only a basic printing press from the 18th century to the 20th century. Their widespread use intensified in the 1990s with the spread of less expensive desktop publishing systems. In the 2010s, inexpensive black and white flyers can be produced with just a personal computer, computer printer and photocopier. In the 2010s, the ordering of flyers through traditional printing services has been supplanted by Internet services. Customers send designs, review proofs online or via e-mail and receive the final products by mail.