They picture the -R as 4X, same price. SKU for 4X and 8X is the same. My advice: Print the page from the link I provide, and have them match it...... in-store, that way you can possibly get all Made In Japan discs.
Remember 4X-8X same SKU, same price.
http://www.staples.com/products/SpotLights/050320/467040/Default.asp