Actually, you really need to get before 1930 for the most part in order to have anything worth any significant value. Franklin Roosevelt was a stamp collector, and because of this, stamp collecting exploded in popularity during his presidency. The Bureau of Engraving and Printing therefore, printed exhorbitant amounts of stamps, and these stamps are still worth very little.
If you don't have anything from before 1930, your best bet might be to try to sell them to a dealer(s) for use as postage. Some have been known to pay around 75-80% of face-value. Otherwise, you can always use them as postage, but if you really have ~$100K face-value, this could take beyond your lifetime to accomplish.
Steve
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