H2 Nav data disk

Hi can anyone tell me where I could or how I could get a disk without going through the parts department at GM or the Hummer Dealership ? We just purchased a used Hummer and found out we have to get the Nav disk.
 
Thanks,
Victoria

eBay ALWAYS has some Nav Discs.
 
Just search GM Nav Disc!!

Personally, I'd go back to where you purchased your vehicle and ask them to supply you with the disc that should've come with your H2's nav unit from the 'get go'. The Hummer dealer wants over two hundred bucks for these nav discs, which really isn't an expense that you should have to be accountable for, especially if you just recently purchased your pre-owned H2...unless, of course, you lost or damaged your vehicle's OEM nav disc. The nav disc that came with my pre-owned H2 is pretty well scuffed-up (prior owner was obviously an ignoramus when it came to handling discs); however, it still functions fine. I'm unsure how the up-to-date nav disc replacements work, but I was advised that I would probably be responsible for purchasing subsequent updated discs, as most new vehicles come with two free updates. If all else fails, then you can utilize the following link...good luck.