Usualy broken glass is the cheapest.
I would have to say Pyrex
It really depends on the area your living in. But the cheapest places to get a glass conference tab is to go directly to the source ,which is a warehouse that manufactures it or a wholesale because they sell the cheapest.
because it's the cheapest thing around that does what glass is supposed to do! It's basic ingredient is sand (silica)
I am sure you can call around and price compare at the local shops that fix windows. The cheapest way to get it fixed would be to find someone not in a shop to do it.
Depends on the size, but go to a demolition site or a landfill. You can get the glass free and then use $2 glass cutters to get the size you need; as long as it is not too big.
The cheapest to listen through walls is a long glass cup with a narrow bottom and wide top.
There are several off the shelve repair kits for repairing and filling cracked glass. If the glass is your car windshield I suggest that you get professional help as the process might be fairly high for a amateur to handle.
Many car shops offer to repair broken windows, however there are specific auto glass shops specified for such jobs. The cost of the repair depends on the quality and condition of the glass.
auto salvage yard, carefull removing
Boat hulls are currently usually made of fiber glass. Fiber glass is the cheapest, most effective material. Boat hulls can also be made of wood, carbon fiber, and steel.
Original muffler location best, but I advise against. They are called glass packs because they are packed with fibreglass which burns out leaving you a hollow shell. they are also usually the cheapest quality mufflers you can buy.
Crystals or glass are probably the least expensive material that attempts to appear diamond-like. An appropriate noun might be paste.