The Best Online Fax Services
SRFax

SRFax is the best alternative if your needs fall below the lowest tier that Fax.Plus offers, but you still need a number and the ability to receive faxes. You can get your own fax number with 25 pages inbound or outbound for just $3.29 a month. If it's feasible to pay for a year, the monthly charge lowers to only $3 a month. SRFax supports over 100 different file formats, similar to MetroFax. A difficult to find feature in an online fax service is support for content stored inside of a Zip archive. SRFax supports this!
SRFax also allows you to set numerous fax customizations. Many users have expressed the ability to set a default number of retries on outgoing faxes is very helpful. SRFax doesn't put a limit on the number of attachments you can include in your faxes. You also can choose whether the recipient receives your fax attachment files in a PDF or TIFF format. Another quality that sets SRFax apart is the ability to send broadcast faxes or send a single fax to multiple numbers. SRFax also offers a Lite 200 plan for $6.95 per month with 200 pages, and the Standard 500 plan for $9.95 per month with 500 pages.