Materials:
retaining wall stones $1.98 each (red, grey or tan)
sand $4.98 (bag)
lava rocks $4.98 (bag)
pea pebbles $4.38 (bag)
tools:
level https://amzn.to/2q6uxmU
shovel https://amzn.to/2QcljA8
wheelbarrow https://amzn.to/33H7a1Z
mallet https://amzn.to/2KhEJzX
tape measure https://amzn.to/2KvhzGv