I purchased a bulk load of 000 padded envelopes and still have some to sell in small quantities for those collectors who have trouble finding them at a good price.
They are 8.5 x 5 inches (outside dimensions) and 7 x 4 inches (inside dimensions). They have a self-adhesive flap. The best part is that these are "poly" bags - meaning the outer cover is plastic, not paper. This should offer better tear resistance as well as protection against winter snow and rain. You can write on the outer cover with a pen or permanent marker, or use labels. The envelope itself weighs far less than an ounce, so it doesn't hike your postage rates. It is very flexible and should qualify for the first class letter rate or the flats rate, depending on the thickness of your contents. They have the small air bubbles you know and love.
I accept checks, money orders, or PayPal (including credit cards) to the e-mail address listed. Immediate shipping. USA only, sorry.

10 envelopes = $5.50 shipped
20 envelopes = $8.50 shipped

No need to "reserve" here - just send any orders. My mailing address & PayPal info are linked on my Coins/Chips page (link below).