How to Acquire Stamps : Page 144
Thus, a packet of two thousand all-different stamps ofthe world would be very likely to contain all of thestamps, or a great proportion of those, that were con-tained in a packet of a thousand different stamps of theworld.
With so many stamps available it is comparatively easyto make up a packet of one thousand different stamps ofthe world. There are a great many very low-pricedstamps that may be included in such a packet and, hence,such a packet may be sold at a very low price. It's likebuying wholesale. If you request just one stamp, the verylowest priced, it would, in all likelihood, cost you twocents. But if you purchase a thousand different stampsput up in a packet, the cost would be less than threedollars.