Most cities have one or more industrial supply companies,
including Grainger. There is no reason why Grainger, or any of
the others should not sell to you; I have purchased goods and
tools from many of them over the years.
Failing that, give MSC a call at 1-800-645-7270. MSC is a mail
order company that covers the entire country. In the 1997-98
catalog, on page 1606, I find letter and number sets. There are
quite a number of them, so let me pass on the from
their catalog regarding a 1/4" set of numbers and letters, part
number 00201566, net price $48.56, plus shipping. Usually they
ship via FedEx, and delivery is overnight.
From personal experience, I am sure they will discuss your need
and advise you accordingly. Many cities have a local sales
representative who can possibly allow you to look over at his
catalogs. Good luck!
No, I have no relationship with MSC other than that of a