Here's a good 5oz option:
ht tp://riflestocks.com/store/product95.html
I like the solid model.. Can't dig up the actual weight but it's probably not a lot more:
ht tp://riflestocks.com/store/product93.html
Ordered mine from Brownells.. Don't forget to lube the inside of the pad before sliding it onto the tube. Makes the difference between easy-peasy and lots of grunting and swearing.