ive had to choose several for my micro before i pick one.i found a couple i think are pretty decent:
https://www.thestar.com/news/canada/2018/02/27/ottawa-hikes-tax-on-cigarettes-in-federal-budget.html

https://www.argusleader.com/story/news/2018/02/15/counties-want-alcohol-tax-pay-alcohol-related-crime/336659002/

if you want some other articles look on news.google.com and type in 'taxes on...'
it's best to choose something that creates externalities so you can talk about that and social and private benefits , etc.
im assuming youre talking about your micro IA ofc - cant help if its another one sorry