It is the problem of Ups. If order online tell them to use postal office. I ordered from U.S almost every month, never being taxed.
If you don't have insurance, order online is way to go. I remember I saw a documentary on TV said they are ok. They would be lack of frame adjustment obviously. But I did that myself all the time since frame would bend with use.
Another way is bringing a old frame to Costco. They would put new glass in for you. It was 40 dollars.