They cost about 40 bucks to repair each speaker
The cost of a wall speaker will depend on the type of wall speaker you purchase. As of 2013, you can purchase a wall speaker for anywhere between $30 and $200.
Speaker cable is used to connect the speaker outputs on audio devices such as a receiver or amplifier to the inputs on the speaker(s).
There are audiophiles who believe that the type and the manufacture of speaker cable is critical to sound quality and they are willing to spend several thousand dollars in some cases to obtain the "best" speaker cable. This answer ignores the audiophile community as they would not seek an answer to the question of speaker cables in a forum such as this. Speaker cable in its basic form is there to pass electrical energy from an amplifier to a speaker. Generally, the bigger the copper cable, the better it will do the job. For that reason, low cost solutions often use mains power cable. A mains flex rated for 20 to 30 amps will work well and will not break the bank. Take a look in hardware stores for an endless supply of mains flex. Alternatively, dedicated speaker cable can be bought in any electronics and hi-fi stores although the cost of speaker cable in stores can be considerably higher than very similar specifications of mains flex.
TRS is the name of the type of connector (e.g. 1/4"/6.3mm jack) and speaker cable is exactly what it is, speaker cable.
The cost of basic cable varies between different companies. As of 2014, the average cost of basic cable is between $15 and $20.
my cable, 239 channels, is $60 per month
No. As long as the cable is the correct gauge for your speaker load, there is no difference in sound between expensive cable and "zip" cord.
Speaker cable can be used bare or with pin, banana, spade or ring terminals.
Computer speaker cable is twin axial cable used for transferring a signal generated by a computer to speakers for broadcasting sound. Electronics companies such as Maplins sell speaker cable as do third party retailers such as Amazon.
Digital cable channels can cost more money. How much more they cost depends on your cable company, some companies do not charge extra.
Depends entirely on make of car. I did it recently on my Taurus, it cost 38 for cable and an hour of my labour.