I found a June Taylor ruler at Walmart for squaring up HST's and I love it. At the time I bought it it was $13, but that was some time ago. Their website has it listed for $25 but Walmart might still be cheaper. It doesn't have the locking feature that the Bloc-Loc does so if that is an issue you might want to invest in them. I'll stick to the JT.
http://store.junetailor.com/store/p-...les-ruler.aspx