Date of Purchase
For each book, set a date of purchase. This will be useful when determining price trends. For example, I paid $4 for a book in 1998 that today would sell for $18. When I enter in the price paid for the book, it doesn't have a way to take into account the era of purchase (ie. inflation/trend) and skews the current pricing of the books with Comic Book Realm's online guide.
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