St. Patrick's Day 2018 lands on a Saturday this year (March 17), which is reason enough to celebrate. But whether you're watching a parade or hitting the bars, you'll want to look the part. Luckily, there's still time to find the perfect St. Patty's Day T-shirt on the cheap (and fast if you're an Amazon Prime member with free 2-day shipping). Here are just a few styles to consider.If you're aiming for subtle, this vintage-style tee will do the trick. Who can resist a little word play and T-Rex humor? It's your one day to shine! Show you're a true friend of the crown with this nod to the Bud Light Dilly Dilly commercial. This Lucky Charms-inspired t-shirt is way too soft to wear just one day out of the year. Be sure to check out our Amazon coupons page for even more savings, and save the day of with Groupon's St. Patrick's Day deals.