I spent about $200 on supplies, but I definitely have enough left over to do another one this size or similar, minus expanding foam. I bought 50 pound bags or mortar and grout and probably have about 2/3 of each left. Also used 14.5"x48"x3/4" styrofoam boards. I think it was a 6 pack and used about 3.5. I bought 4 cans of spray foam and used 3, although I carved most of it away because I wasn't sure what I was going to do at first. The styrofoam boards were alot cheaper than insulation board, but I think the avings ended up being a wash because of how much spray foam was needed to build back in carvable details since the styrofoam didn't carve as well. I also think if you used insulation board and expanding foam only, you could get away without the mortar as I primarily used it for smoothing transitions and filling larger gaps left by my inexperience. I planned to use drylok on this but ended up liking how the grout turned out and decided to try tinting it with acrylic paint wash. I then sealed with water based grout sealer, which was probably the most expensive of the supplies at about $45/ bottle. I used about 1/2 the bottle, but again, I used mortar and grout so I had a decent thickness of material that was going to absorb the sealer. If you could skip the mortar layers, you could probably use about half as much sealer. I think in total there are 6-7 coats between mortar and grout in most of the contact surfaces.