What purchase do you regret the most under $30?

brandon thought this was worth mentioning said
5

I'm split between the knockoff iPhone charger that I for some reason won't throw away hoping it'll actually charge something once and the (popular local deals retailer who dabbles in goods) "give us $10 and we'll send a mystery gift" that, even with my purchase history available, led to me receiving a women's size 7 pink stone ring.