After visiting several stores and not finding any maternity underwear, I decided to look online. I checked several different sites, and Walmart.com happened to have what I was looking for: a set of full-coverage maternity briefs, reasonably priced for $8 (plus shipping and tax).
The set includes 3 briefs: white, tan, and black. I don't really care for black that much, I would prefer another white and tan instead, but it is not that important. What is important is that the briefs offer full coverage, going over the tommy, above the belly button. I can't imagine how anyone can be comfortable wearing those under-belly pants. The fabric is just right, medium thick, and the fit is comfortable. One thing to keep in mind if you want to try these is that they are rather large, so you can safely buy your pre-pregnancy size. I bought two packs, Small and Medium. Small is perfect right now as I am on the 5th months, and I am saving Medium for later.
If you are looking for something that will comfortably cover your pregnant belly without costing a fortune, this is a great buy.