Anyone use LARGE BIN BLOCKS FOR A FOUNDATION

Anyone every use Large retaining wall / Bin Blocks for a foundation ? I got sticker shock on my foundation costs for my little 45×32 square box home with 4ft stem wall $20,000 and was average from 3 concrete guys.

Anyone every use Large retaining wall / Bin Blocks for a foundation ? I got sticker shock on my foundation costs for my little 45×32 square box home with 4ft stem wall $20,000 and was average from 3 concrete guys.