Often quicker to write your own.
Other peoples "written" scripts are usually localised with "in jokes".
If you're looking for new gags and stuff, there's a book just out, can't remember what it's called though, which lists loads and laods of panto gags and stuff.
Check Amazon or some book sellers on the net.
I'm revamping (still) my ones.
Try searches like...
http://www.google.com/search?hl=en&lr=&ie=...anto+%2BscriptsAnd would you believe it... My Mini panto is top of the list...