wrote:
Other than the obvious way of me having to beat on large rocks with a
big hammer, are there companies that will crush 1,000 pounds
(approximately) of rock to 'custom' sizes?

Would this be a 'reasonable' thing to do, or are most types of popular
rock generally available as 'crushed'?

No, and yes...

For a batch so small it would undoubtedly be very difficult to convince
a crusher to deal with a "one-off" like that at all, and if they did
I'm sure they would be quite pricey.

What do you have and want? You should have no trouble finding most
anything that is used at all commonly...