I pay like 44.95 for comcast cable internet. The bitch is you have to keep cable TV, which I don't watch cable and have digital so the total TV and internet bill is like 105.
I thought about buying my own modem. But the renter I had went out after 2.5 months and I went and bought one, then got another from comcast. To buy = $130 to rent = $5/month. So it would take 2 years to pay it off. And if it went bad and it was yours, oh well.