I purchased an 18' tipi from them in 1974, and spent two comfortable winters at 9000' elevation, high on the Continental Divide in Colorado. They are honest and have integrity. Ask for Jeb - tell him Lew from Shelter sent you.
Crystal grids can be more powerful than using just a single crystal for an intended goal. Crystal grids are made by the intentional placement of stones or crystals in a geometric pattern for the specific purpose of directing your energy towards a goal. The stones or crystals are then charged by your intention and energy.