What you show us is not what you are doing. Are you sure you are using double quotes (") rather than single quotes (') when you set $htmlvar?
use warnings;
use strict;
my $price = "50";
print "$_\n" for "<li>The price is \$$price</li>", '<li>The price is \
+$$price</li>';
Prints:
<li>The price is $50</li>
<li>The price is \$$price</li>
Maybe you need to give us some code we can actually run that shows the problem if quoting is not the issue? (See I know what I mean. Why don't you? and SSCCE.)
Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond
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