Notorious Errors That Are Affordable?

The 1937-D Three legged Buffalo nickel I wouldn't call a variety. I would think of this as an error. The first coins made with this die was normal and later after too much die polishing they removed that fourth leg. So I would not think it fits into the variety category. In order for it to be a variety, it would show on the earliest strikes. It only shows on the later die states. Same also on the 1922 no D Cent. All the dies were normal when they started. They were over polished later to create this error.

For a nice variety, I like the Kennedy 1964-D Quadruple Die Obverse. It's very prominant even to a novice and available for around $50. Also love the 1956-1964 Type B quarter series.