pond liner/accessories (Southern, New Hampshire)

I would like to build a frog pond in my yard this Spring so I am looking for a decent sized, pre-formed pond liner (not a “tarp”) that I may repurpose. The liner should be in good working condition and able to retain water (with no holes or cracks). If anyone has one in the So. NH or No. / Central MA area you would like to part with, please let me know.