I had made an account on their website when I ordered the under hood and side vent lights about 2 months ago. I started getting emails after, announcing sales, new products, or when items were back in stock. I got the email 21 August and I jumped on the site a few days later and was able to order. If you haven't created an account, that is probably the quickest way to get on the maing list. They have a rewards program, military discount, ambassador program and other ways to save some money when buying from them. Check the bottom of their website and you will see it all there.
I believe the puddle lights are sold out at the moment but you can preorder so when the next batch come in, you will get yours.