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A theodolite machine is a tool used by land surveyers to measure verticle and horizontal angles. A digital theodolite machine is one with a digital display. You may fine video instruction on how to operate this machine on youtube.
$450 USD open market used
Digital antennas usually cost around $40. However you can find cheaper digital antennas that are used.
Used commercials cost depends on what kind of used commercial you are trying to get. For instance, If you get a washing machine or dryer it is usually $1,500 to $3,000.
If you want to buy a used elliptical machine, learn as much as you can about it before you do. Learn how used the machine is and what the original cost was. Amazon.com is one of online store that sells cheapest used elliptical machine. You can visit www.amazon.com.
The average cost of a digital TV converter is around $30-$40. However you can find digital TV converters for less money if they are used.
Digital
When buying a used ultrasound machine you should be expecting to pay at least 5000 dollars depending on make and model. These machines can be used in a hospital, but they have to be kept up to date.
Digital slr d200 costs between $964.99 for new one on amazon, while for used one on amazon it costs $499.99, which is reasonable compared to many places.
$50 or less for a basic used machine that's not much more than a cash drawer and adding machine, up to $1500 + for a high end machine that will provide much of the functionality and reporting capabilities of a full blown computerized point of sale system.
A new rowing machine cost somewhere between $600 and $1000. You can get a used one at a many thrift stores or a consignment sports good store such as Play-It-Again Sports which can be found at many big cities.
Depending on the model and manufacturer, a digital projector can cost anywhere from $299 to over $1500 and beyond. Another source for digital projectors would be used and can be found on ebay or Craigslist.