Digital BW, The Print

Hi, I just made a sale for one of my images.  The client wants it as 
a 20x30.  SInce I only have an Epson 2200, I obviously can't do this 
one myself.  My local pro place no longer does wet darkroom prints; 
the guy said they output everything digitally but develop it in RA-4 
chemicals, which aren't "real black and white."  It would be $66 for 
the print and an extra $15 if I had them scan it (drum scan) as 
opposed to supplying them with the file  (I admit I have no idea what 
RA-4 is and how it compares to a traditional black and white print).

So, my questions are: (1) Has anyone used RA-4 process for black and 
white enlargements, and what was your impression of the 
quality/tonality, etc?  and (2) Does anyone know of good places I 
could send the negative or scan to for output this large?

Thanks!