GM Extended Warranty Cost (revisited)

[NJ H2]

I know this has been talked about to death but prices change bla bla bla. I bought my H2 new in 2004 and have almost 36,000 miles. I know I need to buy this before it hits 36,000 or I'm SOL!
Here is what my Dealership is charging:

12/12, 0 ded, $720.00 + $500.00 Hummer Charge = $1,220.00

24/24, 0 ded, $1,625.00 + $500.00 Hummer Charge = $2125.00

36/36 0 ded, $2,136.00 + $500.00 Hummer Charge = $2,636.00

48/48, 0 ded, $3,200.00 + $500.00 Hummer Charge = $3,700.00

Does this sound right?
I'm not to sure about that $500.00 Hummer Charge

TIA