Skype continues to offer its unlimited calling plans starting at $2.99 per month. Or, sign up for a 12-month plan to get 15% off and drop the monthly rate to $2.54 per month. (The discount appears during checkout.) That's tied with our June mention as the lowest price we could find for this VoIP service. The base plan allows you to make unlimited calls to any phone within the US and Canada from your Skype phone. Unlimited calls to North America or over 40 countries cost $7.99 and $13.99, respectively. (The 15% off discount also applies to these plans when you sign up for 12 months.)
Of note, to receive calls to your Skype phone, you must sign up for an online number. Subscribers to one of the unlimited plans pay $30 per year; otherwise, it costs $60.