churchpartner.com has prie dieux for $300-500, depending on what kind you want and if you want it upholstered for kneeling, etc.
We have a little corner table that is kneeler/chair eye level and upon it is pictures of the Sacred Heart of Jesus and Mary. We have a couple small statuettes which each hold meaning to us and numerous prayer/saintcards stacked and upright. We also have a large candle and several small votive candles which we light and replace frequently (the big candle lasts for awhile). We sometimes place flowers on the table, there is a rosary and prayer book. Underneath the table we keep a basket of books which we are currently reading to enhance our spiritual growth. We also have a book of intentions and a pen in which to continue writing them. Next to the table on either side of the corner, we have two saints’ framed pictures (who are specifically important to us) nailed at eye level (one on each side).