MSA MMR masks?

[CVFD26]

Does anybody out there know where I can find some used or fairly cheap MSA MMR masks that are still able to be used. My dept. is in the process of switching over to all MMRs but right know we only have enouph masks for the packs, so if a mask messes up the whole pack has to be put out of service.

Thank You
George Hagerty
firefighter
ColumbusVol. FD

[ADSNWFLD]

You can purchase a kit (unk $) to convert your old masks to accept the mask mounted regulator.
The old piece that attached to the low pressure hose screws off and the new piece replaces it.