It depends what you want it for. There are large poster-sized star charts and also books of star charts available commercially.
There is one
here that is optimised for SynScan alignment stars, but is also a handy general reference - it's A2 and downloadable/free.
Here's a quick (semi-random) selection of commercial reference material:
http://www.skymaps.com/store/cat10.html
http://www.allposters.com/-st/Astron...rs_c50424_.htm
http://www.astroshop.com.au/products...sp?id=MAS-002I
http://www.bintel.com.au/Accessories...oductview.aspx
http://www.bintel.com.au/Accessories...oductview.aspx