Hi
Here is a link to the ifixit guide to replace your screen.
[guide|37520]
Here is a link to just one supplier of the part. Perhaps you should verify with them that the part is compatible with your model before you purchase if you decide to use them. There are others online if this one doesn't suit you.
http://www.ebay.com/itm/New-LCD-Display-Screen-Repair-Part-For-HP-Slate-7-2800-2801-4601-slate-7-1800-/262580136220?var=&hash=item3d22fee91c:m:mKptEu90rES9h_D_B7JrDsQ
Alternatively, if there is a part number stamped on the back of the LCD screen in your tablet, search online using just the number to hopefully find suppliers of the part.