The purpose for window envelopes is simple. In order for business to save time, as well as ink and toner, the letters and correspondence written are labelled with the address, and folded in such a way that it doesn't have to be reprinted on the envelope itself, but will show through the window.
Based on my searches, you can find to buy window envelopes online from windowenvelopes.com. Here you can find many types of window envelope that you need.
Window envelopes are so widely used by small business because it helps cut costs and is more efficient than traditional envelopes. They come in many different sizes for all size business needs.
It would be cheaper to buy single window envelopes and have your address printed on it than it would be to order double windowed envelopes. Double window envelopes (depending on how many you buy) runs from 38.99 to 72.49 a box. With one window and printed addresses it runs from 22.99 to 61.99 with an additional that you will have to speak with a rep about.
The purpose of coin envelopes are for containing currency like coins when being mailed or exchanged. Because these envelopes are multipurpose, other small items can also be inserted in them.
Staples carries a few different brands who produce business sized double window envelopes. The approximate cost, depending on the brand, ranges from $35-$65.
A great site for double window envelopes is: www.envelopes.com. Not only can you find double window envelopes but they offer variety to fit your needs. If you have a certain color or size you would prefer this is the site for you.
I myself burn alot of CDs and am in need of those frequently. I typically shop at WalMart or Radioshack. Check out those websites or memorex.com or any of the above mentioned.
The purpose of mini envelopes are to enable the user to send or store items that are small in nature. The mini size typically is less than a Letter or A4 sized piece of paper folded in three.
1+1 = WINDOW
Prices for windowed envelopes will vary depending on the size and amount of envelopes you are looking for. A good start would be large office supply companies like office Max or staples. These stores generally provide a discount to business owners who buy in bulk.
Envelopes, used for the purpose of mailing letters, can be purchased at any department, stationery, or office supply store. Staples, Walmart and Target all sell these envelopes.
You can find in www.anglianhome.co.uk/window, www.viking-direct.co.uk/, windowenvelopes.com/, www.envelopesuperstore.com/ and a lot of large department store, also, find it on craiglist or used ones