Shipping is coming up for $4
You can also buy the tooth paste for $1 to make up for the shipping charge!
http://m.iherb.com/Nature-s-Answer-PerioBrite-Natural-Bright…
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Translucent Acrylic Outer Shell Travel Mug $1 USD Plus $4 Shipping Was $13 @iHerb
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I have 2 of these and even for $1 (including shipping) they are not worth it, so for USD$5 there is no way I'd order more.
The outer shell cracks and you can't wash it in the sink without the shell part filling with water, the join between the inner and outer shell also breaks very easily so it ends up being unstable and unsafe.
You can buy similar local product (and return it if you have any problems) from any supermarket, department or similar store for under $10 standard price (cheaper on special).