From: Mark Moulding
I did a bulk buy of some 1960's era miniature
vacuum tubes (500 pcs)
for around 50 cents each; the next time I looked, the price from all
vendors who had them had jumped to around $3
There is another possibility (one which I think I saw happening when Guy and
I were buying DS8641's, which we previously discussed here), which is that if
multiple vendors have stock, an initial order might buy up the ones with the
cheapest price, and a second order will wind up being met from a different
dealer's stock, one with a higher price.
Noel