Are you looking for a particular name brand of attie such as cisco spec and Iken. If you are just looking for regular atties then most sites should have them. I can give you a site that I knows still carries bauway bridgless, but I burnt through two of them really fast. I mean dead, no dry burn could save them! If you are adventurous, could try vaperite.com. They have quite a few in stock. Cisco spec,were still available at avid vapor, the last time I checked. The Ikens which are my favs, are pretty much unavailable.
You should try and stock up. I always try to keep a couple extra and try to buy some every time I place an order for
juice. How many atties are you running through? If you are using dark juices, they tend to gunk up the coil and what you think are dead are often just gunked. I have found I can get allot of life out of my atties by using the ressurrection
mod(search for that on this site) whenever they start underperformming. Also, if you have 5volt possibilities then you can try to vape a LR once it has gotten to the bottom of its life on one of those. Be careful with this as if it is not dead enough, it will get very hot, maybe too hot.