Verbatim did make single layer dvds in their Singapore factory. They were a favorite of mine back in the 4x days. I haven't seen them for sale in many years though.
If you can find any Verbatim with the AZO designation on the label, those would be a good buy regardless of country of origin. I haven't seen any JVC disks locally, but apparently they do exist in a few brick and mortar stores.
If you are going to buy online, I'd just invest in the 8x +R Taiyo Yuden disks at rima.com or supermediastore.com. They only seem to be available in 100ct packages however.