You can buy them in walmart, shoprite any chainstore

they have a specific aisle with all the spices there, but they are slightly costly, you could get it much cheaper at indian/pakistani shop

孜然 - Cumin/Cummin seed
辣椒粉 - chili powder
黄姜粉- Tumeric powder
芫荽粉 - Coriander powder
胡椒粉 - black/white pepper powder