I bought a whole bunch of internet cheapies off ebay and they were duds......I'm almost 14 weeks preg with twins and they still say neg....I could have found out I was pregnant earlier if I would have gotten better tests.
from what I've read from other people who have ordered the "bulk" tests off the internet.. they are cheap and cheaply made. Many many people have complained and wound up going to the store and buying them there. I've never had personal experience with them.