Mean coupon codes got me again

...i bought 5 books last night. They were all on someone in my family's wishlist/TBR but I spent $ that wasn't really in the budget. Then I look and it seems I had already purchased one of them already



. At least that was the cheapest one and I used a code on them all, so the duplicate purchase only cost my less than $2 USD....this time).
Sure I saved about $49, but should not have spent the $ without a previous plan on doing so.