Yes, the cover you are referring to is a A.R.E hard tonneau cover. They are painted to match and tend to be very pricey. I wouldn't expect to get a new one for less than $750. Also, not to many people offer those in Texas. Not very easy to find on the net either. So, there is another option. This is the one I have. It is made by Jason. The particular one I have is the Dimension but the one with the hump is the Rage.
Here is a link I found:
http://www.pickupspecialties.com/Jason-tonneau-main.htm
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2000 Chevy Silverado 4.8L RCSB: smoked UPD, Flowmaster exhaust, De-screened MAF, Nelson 93 hot tune. Upcoming installs: trans-go shift kit, Eaton posi, billet servo, ported and polished throttle body...Near future: 6.0/4L80E install with 150 wet shot