Every two months there is a lottery in Taiwan. By matching the last several numbers (or all of the numbers) from your receipt, you can also win some cash just by shopping at a store that provides legal receipts. Foreigners can legally win this lottery!

Match all digits of the grand prize number to win NT$2,000,000

The following applies to the other numbers (but not the grand prize number)
Match the final 7 digits and win NT$40,000
Match the final 6 digits and win NT$10,000
Match the final 5 digits and win NT$4,000
Match the final 4 digits and win NT$1,000
Match the final 3 digits and win NT$200

http://english.etax.nat.gov.tw/wSite/mp?mp=4