\documentclass[margin=3mm]{petiteannonce}
\usepackage{siunitx}
\usepackage{graphicx}
\usepackage{array}
\usepackage{eurosym}
\begin{document}

\petiteannonce[cols=2, count=4]%
{02 99 yy yy yy}
{%
  \tabcolsep=10pt\relax
  \petiteannonceaddtowidth{-2\tabcolsep}%
  \begin{tabular}%
    {@{}m{\petiteannoncewidth{0.5}}m{\petiteannoncewidth{0.5}}@{}}
    \multicolumn{2}{@{}c@{}}{\Large \dotfill Vend Baignoire enfant \dotfill }\\
    \hline\\
    Vend baignoire enfant.\newline 
    Dimensions \(\SI {80}{\centi \metre }\times \SI 
    {30}{\centi \metre }\)\newline
    Prix 20\si{~}\euro
    &
    \includegraphics[width=\petiteannoncewidth{0.5}]{baignoire.jpg}
  \end{tabular}
}




\end{document}

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