Shopping for a Bell Jar to Display a Doll?

I am looking for a clear glass cover to display and protect a porcelain doll. Preferably something with a rounded (oval) top and sitting on a mahogany base cut to keep the glass bell in place. It would have to be approximately 16 inches (41cm) in diameter at the base and 18 inches (46cm) high. The sides would have to go straight up for 12 inches (30cm) because the arms of the doll extend almost the same as the diameter of the gown. The name of any retailer, manufacturer, or person would be appreciated.

By John from San Antonio, TX