Actually "Colt,an american legend" by RL Wilson was last printed in 1990. I just ordered a copy from Boarders book store. It's out of print but is availible used in good cond.My copy is said to be near new. Price depends on condition. $35 to $65.
Yes, when I say modern, I am thinking within the last 40-50 years. For information's sake, I bought Colt, an American Legend by Wilson, new, from Walmart.com last month for $20.99 plus shipping. I assume they still have them in stock - great buy for a great book!