Walmart offers the Lego 6"–12" Buildable Ruler Set for $8.40. Opt for in-store pickup to dodge the $5.99 shipping charge. That's $2 under our mention from a week ago and the lowest price we could find by $7. Pieces combine to make a 6" or 12" ruler.
What's the most maddening fee you pay? To check your luggage? Bounce a check? Use an ATM? Not even close.