Because of the covid-19 impact, some airmail shipping options are suspended to certain countries until further notice.
For those countries with "economic airmail" options available, they will be either shipped via DHL eCommerce / Hong Kong Post's ePacket with full/partial tracking, the delivery time frame could be 2-4 weeks depending on destination countries (see below).
Shipping rates to most countries are weight-depending, you can get the shipping estimate upon checkout. Please make sure you've entered your full address in your account to get the correct shipping quote.
FREE SHIPPING offer is currently only available for purchase over US$50 when shipping to Singapore, Japan, Thailand, Vietnam, and Indonesia, may be subject to change from time to time depending on international courier costs.
Here are the reference time frames estimated from time to time with weekly updates.