As many of you undoubtedly know, stackable pin header is available in two versions.
The crappy ones, where the pins are stamped out of metal sheet - these are abundant, and absolute garbage. Because the pin is flat rather than square, they do not make reliable contact with some female pin header, and they're also more prone to damage, and generally look and feel to be of poor manufacturing quality.
The good ones, where the pins are square, and which have excellent fit.
Unfortunately, the two are very hard to tell apart in ebay photographs. I had found the good ones on ebay, from a chinese seller whose listing had close up pictures explaining why the other ones are bad. Unfortunately, he doesn't seem to be selling them anymore.
Does anyone have a source that is known to sell the good kind at a reasonable price?