It will most definitely be less than a dollar, accroding to USPS's website it should cost 61 cents: 44 cents for the first ounce and 17 cents for the second ounce.
As of January 27, 2013, the price of a standard first class stamp is 46 cents. This lets you mail a letter of up to 1oz. If it is between 1 and 2oz it costs 66 cents and 3 oz will cost 86 cents.
$0.61
About 4.4 grams.
18 oz.
9000000 GRAMS
0.31oz.
50 grams = 2oz
Approximately 4 ounces
$0.30 - 0.50/pepper. Weighing in at 2oz. it would be $3/lb. Organic peppers are twice that price unless you find a local source or grow your own.
16oz = 1 pound 2oz = 1/8 pound
If you have 586 2oz containers then you have a total of 1172 oz.
2oz = 56 grams ( a more accurate answer is 56.7grams = 2oz )