I would say 1-14 units would be $58 each and 15 and above would be $53 each.
The dimensions are 3 1/4"x4 and it is 1 1/2" thick. Here is a picture of this unit model # 115
This model only has 1 decimal place, so it will read 8.1 or 8.2 not 8.12 etc.
Keep in mind this unit comes with calibration fluid (sache) and the DC power supply as standard, unlike pinpoint which only comes with a battery as standard. The power supply is $10 more I think on the pinpoint.
I sell these for $69 on the website to give you a reference.