Be sure to look up QST 1934, think it is Dec and Jan.  A two part series on making your own crystals, how to visually sight them to determine proper cut, including overtone, how to build a saw to cut slivers, and the Holy Grail of crystal info, the formula for the thickness of the  initial cut based on desired freq.  Radio grade Brazilian quartz is still available,and there is really no reason that if you really needed one, you could not roll your own.

Charlie in NC