I recently purchased this almost 500 gram meteorite whilst in Flagstaff Arizona. This is a Iron/Nickel meteorite from the Canyon Diablo fall (Barringer Crater). Although they usually go for around $1/gram, I paid much less than that. I also brought a number of different meteorites from different sources in the US, but this was the largest. I did see a 3kg meteorite at OPT for around $3,000. I was sorely tempted; I could have used it as a doorstop
It was interesting that OPT sells them but doesn't really advertise that they do, so don't know if they are one off's or not.
Cheers Peter