Silica Sand - High Temperature Mortar IngredientBefore you throw down big bucks for us to ship a bag of this fine grain silica sand to you, check with your local Masonry & or Landscape Supply as this is a commonly stocked item. Depending on your location, prices can range from $10 $15 per 100lb bag of silica sand. Another way to find fine grain sand contact your local Pool Supply Store. Pool filter sand is perfect fine grain silica sand! It is typically sold in 50 60lb bags and costs about $12. 00