There are a number of places you can consult to find catalog prices, see the links below.
The Gibbons site is providing catalog prices, usually Fine to Very Fine condition. If you were to want to sell, you would only be able to get a fraction of that, usually around 25%, for the lower end items (under $100) and higher as you go up in value. Dealers don't normally deal with small value single copies.
Note that the commercial sites are offering stamps for sale at these prices.
You can obtain some estimations through catalogs of places offering stamps for sale. They are not going to provide all the details of identification to determine just what stamp you are looking at. Mystic Stamp Company has an online catalog that is a starting point for US stamps. The stamp section of eBay can help as well, but you have to be careful. There are items there I can buy for a dime that are being sold for over a dollar there.
There are too many factors that go into identifying an older stamp, such as 'grills, watermarks, secret marks, types, cancellations, on envelope, off envelope, error, perfin, BEP, paper, double paper, etc. Then you have to grade the stamp accurately. As a start it would be better to purchase 'Scott Specialized Catalog of US Stamps 2011'. There is a section in the catalog that gives you the approximate value of older stamps according to their GRADE (pages 305 - 348)
Note: Damage to a stamp decreases the value.
Humidity will ruin MNH (Mint Never Hinged) stamps. Stamps should be stored in a moisture free environment.
Vistaprint are a company which produce address stamps for businesses. New customers can get their first order for free and businesses can receive a discount if they order in bulk.
There is a stamp collecting club called Vista, they offer free Canadian stamps when you join their site. Once you sign up you can get 25 mint condition Canadian stamps or 100 used Canadian stamps.
There are many places to sell collectible stamps online. The most popular way is to list them for sale on eBay. They charge a fee to list each stamp or item for sale, plus they usually charge a fee worth around 10% of the selling value of the item. You could try selling them on Craigslist. It's not as organized and you can't reach a broad audience here because people usually are limited to browsing through one city at a time. Although, it should be free to sell them on Craigslist. Another alternative is to sell them on UniSquare's stamps marketplace. It's similar to ebay but there are no listing fees and only a 2% final value fee, which is much lower than eBay. You could make an extra 10% in profit or more by selling your stamps at UniSquare.
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its free absolutely free
When you are searching for a player, you have to change the max value to the lowest value and find the people who are free.
There is a website called "Free digital stamps" they have tons of pictures that can be used. Other then that, they are completely free to use and would be very beneficial.
No, they are not taxable. Stamps are from the US government, so state taxes don't apply. You should be able to obtain them tax free and at face value. Taxes or surcharges have been applied for various reasons, including financing wars and charitable works.
distance and time
distance and time
A car book value is the value of you automobile. Kelly blue book is a free site where you can find the value of your car based on the condition of it.