Dude the thing is that the 'LCD + protective glass (the one thatz cracked for u) + the digitizer' is one single unit fused together during manufacturing. Hence if u have problems like
1. Cracked glass cover (like in your case)
2. Cracked LCD (like in my case)
3. Non-responsive touch screen (like in many cases)
This is what the site says:
The only solution is to get the whole unit that costs between 170$ plus shipping to 250$ plus shipping. Below are the two sites that ship this part and are currently out of stock.
1. pdaparts.com (it redirects to the below mentioned site) : 169$ + shipping outta stock as of now
iPhone Complete Replacement Screen (Gen 1) - Includes LCD & Digitizer: PDAparts is the Palm Treo, HP iPAQ, Blackberry, iPhone, PDA Parts and Repair Specialist
2. ifixit.com: 250$ + shipping outta stock as of now
iPhone 1st Gen Display Assembly - iFixit
or you can get it replaced in Mumbai for Rs. 9000, there is also a chinese version @ Rs. 7000 that is very bad in quality, so rather go for the Rs. 9000 option
Here is his number: 9821166664, Mumbai, Ghatkopar, say that Jay referred (he's my friend and knows this guy)