Budgies are very small in size, and their death rates are highest as compared to other birds. Most of them highly likely survive when in cages. So, you got to care for them by paying a little extra attention. Coming to getting them sand is sometimes tricky as it can cause digestive problems. The only sand that may prove helpful is a sandpaper sheet, but make sure they do not spend all the time on it. You can also observe your bird if they like the product or not.