You can get crystals in any frequency you want.  You will probably have to
order direct from the manufacturer, and for onesies-twosies, you will have
to pay extra and wait a while.  If you're buying at least a few hundred, it
probably won't even cost any more to have them cut to order.

Crystals are "really" for radios, and in that application, oddball
frequencies are the norm and frequencies like 10MHz are the oddballs.

I know our RF guys have a favorite crystal maker that specializes in
delivering strange frequencies quickly.  If you are interested, contact me
offlist, and I can ask who that is.

SNIP

> You may be able to get an off-speed crystal, but I haven't
> done the research
> on that one.
>
SNIP
>

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