My strategy now is to buy on iHerb when items are on sale. I get emails from them frequently announcing sales. I wait for the Sitewide sales or sales of brands that I like.
this double taxation is rampant in Thailand. Tax on service charges, tax on tax, etc. My laundry charges at the hotel include 7% included in the per-item charge, then the whole bill is taxed 7% by the hotel after a service charge is added.
Incidentally, about two years ago, most of my shipments from iHerb were not taxed. Now the advance tax makes sure that all shipments are taxed no matter what the value of the shipment is. Now even items express shipped by my daughter from Washington are taxed even though the packages are not opened. I don’t know how they calculate the value. The tax that I paid recently was about 7% of the postage charge. Taxing is now pretty aggressive. Medicine shipped to me from India just is not delivered to me. I guess that it is seized by customs without notification to me.