Many others that have Bermuda grass and have used the glyphosate products report that they do not do a good job of controlling Bermuda and it would need to be reapplied at least twice during the normal growing season. Iowa State University is also reporting that many of the "weeds" these products are suppoed to kill are not and in some cases the target "weeds" have the resistance to them that the genetically engineered plants have. All of the glyphosate products I have seen cost way more than I would spend, they are very expensive, and I have found that digging out plants I do not want is much cheaper and more effective and longer lasting.

Another suggestion. This will cause a delay of a year, but...
Kimmsr is right - it takes at least THREE shots of glyphosate to kill Bermuda in the area you want to replant. Another option, if you are willing to wait, is to overlay the area NOW with a double layer of black plastic, weight it down thoruoughly around the periphery and down the center, and wait a year. The Bermuda underneath will emerge and slowly die under the lack of light and the heat produced by the plastic.
It needs to go a couple of feet beyond the edge of the future raised bed to kill the Bermuda far enough away that it will not immediately re-invade.
When you build the raised bed, use a DOUBLE layer of geo-textile fabric ("weed barrier") lapping up the inside of the raised bed to the top. This will cause most of any invading Bermuda to emerge on the outside edge of the raised bed where it can be dealt with. The double layer is necessary because Bermuda can zip right through a single.
That is the best protection you can apply non-chemically against Bermuda without using glyphosate.