you can get postage paid envelopes from your post office or online at stamps.com
Go to this link to find if you qualify. :) http://nonprofit.about.com/od/nonprofitbasics/ht/postage.htm
Yes, you would have to pay postage for stuffing envelopes, because it would cause the envelopes to weighh more than they should and shipping and handling goes by weight.
When mailing birthday cards, any kind of postage can be used on the envelopes. Regular postage bought at post offices can be used for sending birthday cards, as can specialized postage stamps that allow the sender to put their own art on the postage.
No.
not as long as you only draw on the side with the flap.
Yes, there's a non-machinable surcharge of 20 cents over regular postage.
The best way to find out how much it will cost to send documents in large envelopes is to take a sample envelope to the Post Office and have it weighed. They will provide you with a quote. Alternatively, you can weigh the envelope at home and use the Post Office online price guide to find out the cost.
You prepay with the post office, they will give you all the deatils.
Time (labor), Supplies (checks and envelopes) and postage. You can eliminate the envelopes and postage if you pay on-line. You would still have paper costs, because you would most likely print out a record of the payment to attach to the invoice.
Mail and stampage is based upon the weight of the mail. As long as the letter is still light, you shouldn't need more postage.
you should charge 3.00 dollars or 1.00 dollars
47 cents, or one Forever stamp for the first ounce.