Dear ___ _ (name):

With thanks we acknowledge your check and order dated _______, l9 __, (date)

for ______ (items) described in our letter to you of _______, l9 __ (date).

Unfortunately, the demand for the ____ (item) has been so great that we have
no more on hand. Despite the fact that we have reordered this, these ____ (item),
we regretfully have no idea when they will be shipped to us. Therefore, we will
gladly return your check and inform you when the new supply arrives. However,
if you prefer, we will keep your check and forward you the ___ (item) as soon as
it, they arrive(s).

Very truly yours,