Membrane Solutions Corp via Amazon has 4-Pack Membrane Solutions 0.1 Micron Straw Water Filter on sale for $33.99 – $8 when you clip the coupon on the product page – 5% when you checkout via Subscribe & Save = $24.29. Shipping is free w/ Prime or on $35+ orders.

Note: You must be logged into your account. Coupons are typically one use per account. You have the flexibility to manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to extra 15% savings when you have 5 or more items in your current monthly subscription.