4.3 Tahoe

[Cal J. Myers]

I have 750 running 4.2 BSD.  I want ot plug in some RA82s into and come
to find out that it doesn't know about these.  I have the 4.3 source
and was going to put up 4.3 on it, but some recommending getting 4.3 tahoe.
So here is my question.  How does one go about it?  Who do you talk to?
And how much does it cost?  
/cal