Escaping dollar signs in Expressions

I'm trying to use an expression to generate a text label with a dollar sign in front of a number in it, and I think the expression is trying to interpret it as an anchor instead of a string.

If there's nothing for an anchor to reference, it's fine returning a string:

But if I try to put that in a conditional, I get null as the output:

And this doesn't work either:

Anyone know a way to escape a dollar sign in an Expression?

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