I bought some night vision goggles from this site around Christmas.
A few months later, I noticed that a mysterious charge for $6.98 was showing up on my credit card bill. When I called the number with the charge, they informed me that I had been enrolled in a monthly membership subscription to their online site that gave me discounts on their products.
I did NOT enroll in that membership and unless I had noticed it on the credit card bill, they would have kept charging me indefinitely.