If our suppliers aren't willing to hold it for us we go to someone that will.

@Ricky De CastroThey are merely a referral service that will put you in touch with their network of Turnkey suppliers.  

How do you go about finding the glass supplier?

Have them register all subs and suppliers, then perform a joint check system when you issue a check to your GC (GC and SUBS/SUPPLIER name on check) to mitigate liens, when signing the contract, the GC needs to name their subs and suppliers, and the GC could not change them unless with written approval from you, put a clause that it will constitute fraud if they deviate from this.

But I would not hire him for charging that much for what your granite supplier will do for free.

There are several other manufacturers as well ... if you drop by your local electrical wholesaler/supplier (the guy your electrician orders through) you should be able to find what you need.

Handyman magazine is handy for the beginner and pro, other home improvement publications and sites are full of techniques, but actual skills take practice to master.You can get an idea of material costs at the supplier, their ads usually have common materials.

Is there a supplier I have not come across yet, or is there an easy fix.  

Make sure to check out some of the areas meetups if you get a chance and let me know if I can put you in touch with any material suppliers. 

As markets tighten up those with the cash will be able to tell contractors and suppliers alike " This is what I am willing to Pay Take it or leave it . " When times are tough both are more than willing to keep your business just to keep their doors open Unlike a few years ago when even your PET GOAT if he could at least make a Mark on a Mort App could buy a property .