My husband and I love finding great deals at garage and yard sales—we’ve found all kinds of amazing things in our adventures (brand-new Ibex shirt for $1, anyone?) As you can imagine, I’ve seen just about everything put out for sale on the tables (and yes, I did buy that bronze frog lamp.) One thing we see a lot are bike helmets. Sure, $5 for a helmet that looks in good shape seems like a great deal, but before you pounce on that fancy new helmet with squeals of triumph and joy, hear me out first....