They have a USB version that would work with your computer.

Your information might be available online but it is definitly NOT the Census Bureau that is sharing the information with the resellers. As one very familiar with the inner workings of the Bureau I can tell you that NO personally identifiable information comes out of the Bureau - ever - even to other government agencies. Your information is protected under title 13 of the United States Code. We even hide data for small area estimates if it is unusual enough that someone might be able to figure what your values are based on their knowledge of that geographic area. We have teams of people that write programs that test this. Anyone who has access to your information is subject to a severe penalty (including jail time) if they distribute outside the Bureau (or even within if those getting it do not have a reason to look at it). The trust that the Bureau would lose if it were ever to go against this policy would cause response to drop and make the estimates extremely poor - it's just not worth it. I can't speak for other government agencies - but the Census Bureau does not and will not ever give personally identifiable data to anyone.