You can always take a budget flight to Thailand to buy your
medicine what... (At the same time you can also buy cheap
clothings, cheap food, etc)
When I went to USA, I noticed that many Americans travel into
Mexico to buy prescription drugs, because the drugs in Mexico are
cheaper than USA. (In Tijuana, a Mexican city next to the US
border, most of the shops along the streets are pharmacies!)
However, when I went to Hong Kong, the situation is different...
Hong Kongers are not so keen to go to China to buy drugs, because
in China, anything can be fake (from fake Nike shoes and fake Gucci
handbags to fake Viagra and fake milk powder). In fact, several
years ago there was an incident when officials discovered that
Chinese baby milk powder was mixed with ash. This created a panic,
and many Chinese parents rush to HK to buy genuine baby milk
powder, causing a shortage of milk powder in Hong Kong. 