No. For one thing, the law has not actually changed- what happened was that Obama introduced regulations that would have stopped ISP's from doing this. The regulations were due to come into effect this year, but Trump has blocked them.
Now at present, they are not selling the personal web browsing histories of anyone, and they are extremely unlikely to ever do so- any ISP caught doing so would face a massive backlash. What they would be more likely to do would be to profile users based on the types of sites they visit, and help advertisers target ads at particular demographics. Many advertising networks already do a similar thing now, and in most, it is not possible to extract any one person's individual browsing history.
There are still ways to hide your activity if you want to, through services like VPN's. Some cost money, some don't, but if you know what you're doing, you could easily make it impossible for your ISP to track your activity.
However no, you could not go to an ISP and buy some specific person's web browsing history.