Edmund Scientific has the headphone Uniprobe on sale for $245. If you use the coupon code TY2 you get an additional 12% discount. I had one mailed to me via UPS 2 day AM delivery for $255 total. I used it today for three hours and at first it's a bit squirrely but works very well once you get a bit of practice. It really does go pretty deep. I also like that the scan seems to be only beneath the probe and not on the sides (I get confused very easily!)
http://www.scientificsonline.com/det...-uniprobe.html