Part of my outdoor project includes a 600 sq. ft. patio. I wanted to do it in bluestone but my landscape/mason has quoted me an excessive amount (approx. $100 per sq. ft. installed). This seems very high to me (I live in NJ for what that's worth). He says doing the job in Techo Block (concrete pavers that look just like stone) will be much less (approx. $45 per sq. ft. installed) -- again, seems very high to me. Anyone have any experience with this?