I shopped around for a domed cake plate to give as a gift. Everything I found was quite pricey, until I checked the Williams Sonoma site. They have an attractive hand-blown, glass domed cake plate for $30.00 (plus S&H). The two pieces invert to form a punch bowl—Alton Brown would approve its double duty function.
http://www.williams-sonoma.com/products/sku548073/?pkey=xsrd0m1|16|||0|||||||cake stand&cm_src=SCH