Hi here's NGC's priceing guide
U.S. Coins
Turnaround times are approximate and not guaranteed. Estimated turnaround begins on the day coins are received at NGC.
Unlimited Value WalkThrough $600 Same day service 24 Hours All U.S. coins. No max value.
High Value WalkThrough $250 Same day service 24 Hours All U.S. coins valued at $500,000 or less.
WalkThrough $125 Same day service 24 Hours U.S. coins valued at $100,000 or less.
Express $55 48 Hours 48 Hours U.S. coins valued at $10,000 or less
EarlyBird $30 12 Working days 12 Working days U.S. coins valued at $3,000 or less
Specialty Gold $28 5 Working days 5 Working days All $1 Gold, $2.5 Gold, $3 Gold, $5 Indians, and all better-date U.S. Gold. Maximum value $1,500 per coin. Five (5) coin minimum
GoldRush $21 5 Working days 5 Working days All dates for $5-$10-$20 Liberty; $10 Indian, $20 Saint Gaudens. Also accepting $5, $10, $25, $50 U.S. gold bullion. Maximum value $1,500. Five (5) coin minimum
Economy $16 21 Working days 25 Working days All non-gold U.S. coins valued under $300, and $5, $10, $25, $50 U.S. gold bullion under $300 per coin (no colonials). Five (5) coin minimum
Modern Special $15 12 working days 15 working days All U.S. coins 1955 to present requiring a special label, including Early Releases and Eagle 20th Anniversary. Five (5) coin minimum
Modern $12.50 12 Working days 15 Working days All U.S. coins 1955 to present. Five (5) coin minimum
All of the grading tiers described here are covered by NGC's comprehensive guarantee of grade and authenticity. Any questions you may have about NGC's grading services can be answered by an NGC Customer Service Representative or an authorized member/dealer. These professionals can help you decide which tier or service offered by NGC best meets your needs.
So if you figure if you buy a graded coin from one of those shopping networks any the offer it for lets say $39.98 for a 2008 Silver Eagle you come out ahead on said coin.
$12.50 certification fee for one coin
$10.00 For Shipping to & from them.....$5.00 one way X 2
$3.30 For Insureance for both ways....$1.65 one way X 2
$26.95 for the 2008 raw Uncirculated Silver Eagle which Shop At Home
Guarantees is a MS-67
Total is $52.75 and you send it off & it does not grade that high your out $25.80 no less the 15 days Ngc has had it plus the time it takes to return to you of 3 days plus the 3 days it took too arrive, totaling 21 days so how did you come out ahead.
Money + Time Equals a Big Headache in alot of the cases, so you have tobe searching for coins which are Key Dates & Semi Key Dated coins too make it worth your Time & Money to have a coin Graded & Certified.
Sincerely
TreasureHunter