This is, of course, a whole different beast but it's my only experience with such things. Glass America came out to my house while I was at work(told me to leave it unlocked with a check under the floor mat). They used "Pilkington" glass and replaced the rubber gasket. The total came to $150. I left an extra $25 for their being so damn cool about the whole arrangement. I don't know what parts of the Country they operate in but a quick web search might net you some savings. They seem to do fine business down here in the Old South.

Sam