The CD or download can prepare an unlimited number of returns, although the user license says you can only use it for personal and family returns. Per IRS regulations, you can only e-file 5 returns, but you can print and mail others if you need to.
If you qualify for free online filing, that's clearly cheaper. If you do not qualify for free online filing, the CD or download version is cheaper overall. You will find the best price at legitimate discounters like Costco, Best Buy or Amazon.
