2.5 power cyclops needed

I need as many as four 2.5 power date magnifiers for my sapphire crystals. Any leads on where to get them at a reasonable price?

I need a large size of approximately 5.6mm x 7.4mm

My local jeweler will install them but does not have them to sell.

Thanks,
bc

I found out the power depends on the distance between the crystal face and the watch face.

I have my items ordered.

bc