Basing purchasing decisions solely on price is rarely a good idea, but with fax machines it can be a particularly costly mistake. In fact, a cheap machine that sends faxes at a slower speed will cost you more over time than a faster, more expensive model. Here's why: Slower machines take longer to transmit faxes, hiking up your phone bill. Over the long run, any initial price savings will be more than eaten up by higher phone bills.
Accordingly, when looking for a fax machine, make sure it has the following two features: It can send a fax at 14,400 bps (or 14.4 KBps), and it uses MMR data compression. These two features greatly increase transmission speeds and, combined, help you minimize your monthly phone bills and therefore your overall fax costs.