Where to donate used tack/ riding supplies?

Posting this in several areas for the best feedback…

We just cleaned out our tack room and tack trunks and we have many many many used items that are no longer needed. Some have been left by previous boarders or students and some items have just been put away for quite some time.
Items would include used:

Saddle Pads
Misc. Grooming supplies ( brushes, hoof picks etc)
Halters & Halter pieces
Lead Ropes
Maybe even a few girths

Would love to donate this stuff to a camp or organization ( non-profit, maybe?) that could use it instead of us throwing it out. We are located close to Columbia, SC. Anybody have any ideas or contact information for a group in need of items such as these?

Thanks!