Did you check at quilterscache.com ? They often have blocks at different sizes. It is a free site and very useful.
The other way would be to make the triangle block and cut it down to size you want. Just remember to line up your diagonal line with the one on the block to keep it all on the straight of grain. Any smaller size would be possible to square it down to.
Last edited by RedGarnet222; 08-23-2015 at 08:36 AM.