Common, scarce and rare Error Notes (U.S. currency; paper money) at Mintmark.com.
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"Some of the more common errors that occur in the printing of United States paper money are interesting and affordable collectibles . . . Collecting error bank notes is fascinating, yet need not be expensive. The market price of paper money errors increases as: (1) the denomination increases; (2) condition improves; (3) the obviousness of the error becomes more striking; and (4) the availability of such errors decreases. In determining the market price of a paper money error, a collector must consider the note's face value. An error in a $100 note will inevitably cost more than the identical error on a $5 note because the $100 note is worth at least its face value. Some collectors specialize in $1 notes to save money, others limit their error acquisitions to denominations of $20 or less . . ." — Collecting Paper Money for Pleasure & Profit: A Comprehensive Guide and Handbook for Collectors and Investors (by Barry Krause; 1992)
