Small Mirrors ?

Most of us use No.4 or No.5 mouth mirrors. Most of the time these are exactly what we need. But working in the posterior of the mouth, in a patient with restricted mouth opening AND while using an microscope it might be mighty difficulty to use these large mirrors. A more useful size are size 2 or Size 3 front surface rhodium coated coated mirrors.
I've been trying to get these sizes locally for some time without success. Can anyone who is reading this help
?