Where Can I Find Realistic Values?

I totally agree

Realistic values are never going to be found in any coin book, those are just starting points, ebay is your best bet, for seeing what a coin sells for ..type in the coin you are looking for, and click on ended listings, then scan the prices, to see some examples close to the one, you are looking for..

Coin books and price sheets don't buy coins, people buy coins..

I have seen coins booked at 200$ sell for 100$, and I've also seen 100$ coins sell for 150$. So check ebay and see what actual buyers are paying for coins,,

A seller can ask whatever they want for any said coin, the only important factor is, what someone actually paid for it..

The problem is that sold listings may not include the coins you care about in the right grade. So, if you are wondering what a realistic price to expect from a dealer is, look at maybe 25% of Coins and Canada. But it depends what you have. Common coins, like say circulated George VI coins, are worth more or less face or silver value depending on the metal. Top graded coins can be consigned to auction and may do much much better. If you have the typical inherited collection of not great grade 1900 & later coins, keep your expectations modest. Give a sense of what you have and we can be much more helpful.