I love this idea -- buying postage stamps in bulk by weight, rather than by number. Nothing valuable in the bag, but hundreds and hundreds of commemoratives, good for trading with people from other countries. The only problem, of course, is time, the time needed to soak the stamps off the paper / envelopes.
I just finished the last 100 or so in the bag, so I'll be heading to 新宿切手センター again before long.
