Can someone offer me a good source to purchase these?

 

I would go to the dealer and buy them, I think I paid around $165. They are easy to install if you are mechanically inclined. If not I would then take them to a local mechanic as they only take about a half hour or less to put in. Just don't continue to drive your hummer if they are leaking, you could overheat and ruin the air compressor and you dont want to know how much that costs.

 

Well twice i've woken up to go outside and see the rear of the h2 slumped way down. havent seen it since a few days ago tho. Either way I'm sure the bags have cracks and are the reason for it. I found them on gm parts direct for $107.