I second this. Many people assume that getting a print
from a 4x5 inch negative would be expensive or a lot of
trouble, but there are labs in every major city which
do this as a regular business.

The lab in Toronto where I get my MF colour negatives
done (Silvano's) wants $6.19 to make a straight 8x10
print from a 4x5 B&W negative or $14.25 for a "custom"
print.

Look up pro labs in your area on google or in the
yellow pages.

Peter.

In defense of professional labs and custom printers (at one time I wuz one).
A truly professional lab has seen it all, in my own case everything from
Grannies getting jiggy to autopsy photographs that needed to be copied and
printed.  And most professional labs are, well, "professional" (like a
Doctor or lawyer) and will print adult content of a consenting nature.  If
in doubt you can ask for their policies (in writing if you're cautious)
before you hand them any work.  The laws in your location may vary but the
only things that can get you "busted" by your lab in my part of the US are
non-consensual images, candid photographs of unsuspecting "normal" people
(not celebrities) of an embarrassing or compromising nature (e.g. up skirt
shots with hidden cams), images of underage models or (since 911) images of
potential terrorist targets.  (The last is BS since it is so open to
interpretation but that's the law of the land.)

As far as copies for personal use, I have seen it happen, but mostly at one
hour labs and other venues with kids pulling minimum wage, again you need to
find a professional to print your work, most fine art photographers use pro
labs at one time or another or in-house labs, they rarely have time to
shoot, print, promote, etc. and need to delegate some of the "grunt" work.
Which is why reps and custom printers are still around.  And the same holds
true for digital workflow as well as conventional wet darkroom printers.  Or
lithographers, or foundries (for bronze), or ... (you get the idea).

An unsigned knock-off print with no signature or provenance is never going
to be worth the same as a signed and numbered limited edition print. It can
never be sold either since you hold the copyright.  If you don't hold the
copyright your efforts to market this image may be brought up short, anyway.
Just having the negative in your possession may not give you the right to
reproduce it, but that's the subject for another posting.

(I personally don't buy into the limited editions philosophy and regard it
as only a way to artificially limit the number of images that can be
produced from a concept in order to control the price (much like the diamond
cartel in South Africa), it has some merit in the case of fine art
lithography, where the final image is a production from a printing press,
e.g. Terry Redlin prints, etc. but not so much in the case of photographs
where each silver print is an individual expression of the negative's
content. Why limit my income from popular images in an effort to
artificially inflate a price? But that's the subject for another posting.)