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I forgot to mention, if you need more info about Sfax apps, check out their blogpost for iOS - http://www.sfaxme.com/community/blog/the-new-sfax-mobile-app-for-ios-is-now-available-to-download/ and andriod - http://www.sfaxme.com/community/blog/sfax-app-for-android-now-launched/
It really depends what you're after. The cheapest plan around is probably going to be SRFax's Ultra-Lite Plan. But if you're sending high volumes of fax, I'd recommend Ring Central. Have a look at FindaFax. You can compare online fax services to find out which plan will work best for you.
We utilize online faxing services for our small business in the e-commerce space as well. When selecting a provider, we considered price, ease of use, customer support and robust and REStful API. We explored a number of companies and found that Interfax.net has a pay-as-you-go service which is amazing because there were months when we only faxed less than 20 times. Also, their customer support system was a great experience because we spoke with someone from Texas, and not an outsourced group. The best thing was their systems - we were able to plugin their internet faxing solution to all of our devices - allowing us to send/receive faxes wherever we are. Would definitely recommend checking out Internet Faxing
Hello, for a good online fax service, you should take into considerations some of the following factors: reliability, security, price, options provided, sending options (by web interface, by email, by mobile phone, etc.), customer support and other. I think you should first understand and define your basic faxing needs, and based on this start searching an online fax service.