An article containing general information about collectible coins exists online at the Federal Trade Commission website (consumer.ftc.gov) and specific information on pricing is available online at the Professional Coin Grading Service website (pcgs.com), as of 2015. The FTC information is mostly advisory information for newer collectors.
The Professional Coin Grading Service (PCGS) mainly provides prices for coins, including the Morgan dollar, buffalo nickel, wheat-backed Lincoln cent, and territorial coins from before 1900. The PCGS also provides pricing information on proof and mint sets.
The FTC warns prospective coin collectors to conduct as much research as possible before buying collectible coins. Buyers should ask about such things as the coin's melt value and grade and company return policies. The site also provides tips for private buyers to avoid being ripped off, and it lists a glossary of coin terms.