Hi there Aleko,
I have searched the supplier directory for you and had difficulty in terms of specifying the"replacement" lenses.
What we have though are suppliers for sunglasses.
I suggest to communicate with the supplier since they might the brand, they ought to have packages that may include the lenses.
LA Times Trading IncLink hidden: Login to view
SunrayzzImportsLink hidden: Login to view
DevilWear LtdLink hidden: Login to view
Mass VisionLink hidden: Login to view
You may also want to visit their website - Link hidden: Login to view
since they have a separate page for custom designs.
Hope this helps.