Vitamin D (so many people are deficient, it turns out! And my doctor prescribed a rather high dose, and what's sold here is very low dose and more expensive)
Probiotics are far less expensive from iHerb than any I've found in Israel, and they don't weigh much!
EO shower gel (we like this kid friendly all-in-one shower product that doesn't irritate our skin!)
Ricola throat drops (these work out to be only slightly less expensive than the local price, so I use them as a "filler" product, never as my "reason for buying")
Witch Hazel (it's really not easy to find witch hazel products in Israel, though there are a few pricey ones. If you love witch hazel, you'll be thrilled with iherb's price. This one is a toner with alcohol in it - some people like the alcohol in it, but if you don't, they also have
plenty of no-alcohol witch hazel products)
Coffee Filters (unbleached) - I can find the #4 size locally, but I use the #2 size, and it's so easy to order it, rather than running around town!
Brown Rice Pasta (only when they're on sale, great for people who don't eat wheat! The local equivalent is more expensive unless there's an amazing sale)
Grapefruit Seed Extract (I checked out a similar product, 1/4 of the size, that cost more than twice as much at my health food store! Many people are convinced this extract keeps colds away!)
Essential Oils (I use them in homemade cleaners) - for a fraction of the price of the ones sold here in Israel! Yes, they are real and natural (and not an MLM - HUGE plus!)!
Aquaphor Ointment - impossible to buy locally! (The product that is considered "equivalent" is really not.)