How to write left arrow with a dollar sign?

Something like this?

\documentclass{article}
\begin{document}
$ {\leftarrow}\vcenter{\hbox{\scriptsize\rmfamily\upshape\$}} $ or 
$ {\leftarrow}\vcenter{\hbox{\tiny\rmfamily\upshape\$}} $ 
\end{document} 

---

Addendum, to incorporate some additional information provided by the OP in comment. It looks like this symbol should be assigned the type "mathrel" ("relational operator"). E.g., one could define a macro called (say) \getsdollar as follows:

\newcommand\getsdollar{\mathrel{{\leftarrow}\vcenter{\hbox{\tiny\rmfamily\upshape\$}}}}

and then write x\getsdollar \mathbb{Z}/n\mathbb{Z} in the body of the document (in math mode, of course).

A version that scales in subscripts and superscripts. Use a different factor than 0.7 if you want a smaller dollar sign.

\RequirePackage{fix-cm}% arbitrary scaling
\documentclass{article}
\usepackage{amsmath}

\newcommand\leftarrowS{\leftarrow\joinrel\smalldollar}
\newcommand\rightarrowS{\smalldollar\joinrel\rightarrow}

\makeatletter
\newcommand{\smalldollar}{\mathrel{\mathpalette\small@dollar\relax}}
\newcommand{\small@dollar}[2]{%
  \vcenter{\hbox{%
    $#1\textnormal{\fontsize{0.7\dimexpr\f@size pt}{0}\selectfont\$}$%
  }}%
}
\makeatother

\begin{document}

$A\leftarrowS B\rightarrowS C$

$\scriptstyle\leftarrowS$

\end{document}

\documentclass[10pt,a4paper]{article}
\usepackage{tikz}

\newcommand{\ArrowS}[1][1]{%
    \tikz[baseline=(a.base)]
        \draw[stealth-,shorten >=4pt] (0,0)--(#1,0)
            node (a) {\$} ;
}

\begin{document}
Foo \ArrowS Foooooo \ArrowS[3]
\end{document}