The costs are assessed by the state which issues the licence, and they vary from state to state. You need to inquire with your state's DMV.
My Class A with two endorsements was $35.
Some different endorsements available for a CDL driver include the ability to carry a passenger, double or triple trailers, hazardous materials and school busses. You can view them at http://www.fmcsa.dot.gov/registration-licensing/cdl/cdl.htm
Varies depending on what class CDL and what endorsements you wish to have, as well. A pricing guide is provided by the State of Tennessee (see related link). Note that the costs listed only cover the actual licencing fees, and do not cover the cost of driving school. Note also that you will first have to get a learner's permit for the appropriate class CDL you're testing for, unless you're transferring an existing CDL from another state. You will have to be a resident of Tennessee for 30 days before they will issue you a CDL, but the 30 day requirement does not apply to permits.
As for endorsements exclusive to a CDL, you can get hazmat, passenger, and tanker endorsements. You can also get a motorcycle endorsement, which can be placed on any class of licence. The only endorsement you wouldn't be able to get is the endorsement for double and triple trailers.
Yes, it does. If your Class B job requires additional endorsements (such as hazmat, tanker, etc.), you must still have those endorsements on your Class A CDL in order to perform that work.
X is a combination of Hazmat (H) and tanker (N) endorsements.
CDL training courses are not that expensive. In the state of NY the cost to take the test is $35.00. Most companies hiring will pay for the fees associated with obtaining a CDL.
Only passenger and motorcycle endorsements require a road test of their own.
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That's not one of the universal CDL endorsements, and is a state-specific add-on, or else it's a restriction which is also state specific. Please identify which state you hold a CDL in.
The cost of the CDL and training varies. Generally you can complete the course for around $95. You can try http://www.greatcdltraining.com/default.aspx or http://www.cdl-course.com/
.04, federally, for any CDL, regardless of endorsements. States can have tighter restrictions, including zero tolerance.