I looked back at our records on my wife's procedure and the total cost was about $3500. It was about $1500 for the extraction and placement of the implant itself plus about $500 for the retainer-like temporary "tooth" that hid the hole (it was a front tooth on the top). That was $2000 or so, paid in July 2009.
Six months later, the implant had successfully fused with the bone and the crown was put on over the implant which was about another $1500. This was in January 2010.
So the total was around $3,500 and we were lucky that there were no setbacks or unforeseen complications -- it all went very smoothly. And insurance paid nearly half of both procedures (actually 50% of what they considered U&C), which was a perk to having the work spread out over two different insurance years since it would have exceeded the maximum annual benefit if done in the same year. We wound up paying close to $1,900 out of pocket.