How much does the average dating site cost?

At the two biggest subscription-based sites in the U.S., Match.com ($42 a month) and eHarmony ($60 a month), users can save by signing on for, say, a six-month bundle ($24 per month and $40 per month, respectively). And some sites, like PlentyofFish.com and OkCupid, offer basic membership for free.