Out of stock on my go to online stores. Of course I sub for notification when they come in stock and then they are out before you know it again! Even bottle top filters are constantly out of stock. The main sizes .45 and .2 in pvdf no matter how you want it, all out of stock. Whatman and others alike. I know Amazon has 50pack for 180$ but I need a few different sizes and not just one type or style. End rant.