[Hallsons]

It took a little more thought than needed, but here was my solution to get the message to display in the category products list.

I replaced the code in the customer/main/buy_now.tpl:

{if $config.General.unlimited_products ne "Y" && ($product.avail le 0 or $product.avail lt $product.min_amount)}
<b>{$lng.txt_out_of_stock}</b>

with:

{if $config.General.unlimited_products ne "Y" && $product.avail eq 9999}
<b>Out of Stock by mail - pickup at nursery only</b>
{elseif $config.General.unlimited_products ne "Y" && ($product.avail le 0 or $product.avail lt $product.min_amount)}
<b>{$lng.txt_out_of_stock}</b>

And to get the same message to display in the customer/mail/product.tpl file I replaced this code:

{if $config.General.unlimited_products eq "N" and (($product.avail le 0 or $product.avail lt $product.min_amount) and $variants eq '' or $variants ne '' and $product.avail le 0)}
<script type="text/javascript" language="JavaScript 1.2">
<!--
var min_avail = 1;
var avail = 0;
var product_avail = 0;
-->
</script>
<b>{$lng.txt_out_of_stock}</b>

with:

{if $config.General.unlimited_products ne "Y" && $product.avail eq 9999}
<b>Out of Stock by mail - pickup at nursery only</b>
{elseif $config.General.unlimited_products eq "N" and (($product.avail le 0 or $product.avail lt $product.min_amount) and $variants eq '' or $variants ne '' and $product.avail le 0)}
<script type="text/javascript" language="JavaScript 1.2">
<!--
var min_avail = 1;
var avail = 0;
var product_avail = 0;
-->
</script>
<b>{$lng.txt_out_of_stock}</b>

Thank you all for your help!

Chris