I know the Wal-mart in our town isn't renting a XRF gun, I asked a friend who works at the store...
I also talk to a friend who owns the only craft store in my town a couple of weeks ago and she didn't even know about the law.
She said until she is notified about the law and about that changes she is going to have to make, she was not going to do anything different.
She also said that everything in her shop is American Made, she sells craft supplies and her finished product that she makes are usually sold to highschooler for homecoming.
She also stated when she finally gets notified she would contact her lawyer and decide what to do at that time, till then it will be business as usual.