Your personal profile doesn't say which Country / State you are located in.
Here, for the side glass you could go to a the self service wrecking yard.
Removal and installation is a not too difficult DIY.
A new Windshield you can be found for between 160 and 200$ US installed.
Have you tried a forum search? The archive has a wealth of information.
Please click 'User CP' on the top tool bar, and complete your profile with a location and model of your car.
It makes it easier for members to offer advice. MB produced different, and region / Country specific versions of our cars.
Welcome, to take advantage of all the forum features, please re visit the 'Welcome to the Forum' tutorial sticky on top of the W126 page, as well as the two DIY stickies.
It will show how to search the forum (3 words min.), and has a link to the Russian MB site where you can run a VIN#.
Cheers