A quick search didn't reveal any easy ways to obtain a linear CCD sensor, so I guess that's not really an option.
A quick search showed me that Mouser has some
http://uk.mouser.com/ProductDetail/TAOS/TSL1401CL/?qs=sGAEpiMZZMu3iiO3VE9n1HgqhuDV7hNIKth4B0i4FJo%3D
In fact they have many:-
http://uk.mouser.com/Search/Refine.aspx?FS=TRUE&N=4294758757+15099918+1323043