Hi Church11,
There are some good sources of uncovered latex toppers in post #10 here but these are an online or on the phone purchase and not local to Lexington.
Local factory direct manufacturers may also be a good source but the closest ones to you are about 50 - 100 miles away. They are listed at the end of post #3 here.
Most cities also have some foam shops that may also be able to sell you an uncovered layer of latex.
Phoenix