I have over a hundred railroad ties and many pallets of bricks. The bricks are $100 per pallet and the ties are $10 a piece. I used some of these bricks in my backyard for a walkway. They would work well for projects like that. They are the old bricks that don't have the 3 holes in them. The ties are actual old railroad ties and I think they would work well for retaining walls, parking blocks, etc. Let me know if you have any questions.