If only one pane is broken, take the sash to a local glass shop. They will measure and order you the glass. Put the sash back in until the glass comes in and drop off the sash. They should be able to put the new glass unit in and you can pick the sash up later in the day.

With double pane windows you cannot just replace one layer of the glass . The entire glass hass to be repalaced. A reputable glass company can do it for you.

With your glass being so large, you've got "double strength" insulated glass units (IGU). When one of the pieces breaks, not only has that glass been destroyed, but the sealed airspace has been destroyed as well. The whole unit usually is replaced in such cases. Is it possible to reseal the glass in the same frames? The answer is possibly "yes" from a technical standpoint, but 'no' from a practical one. The time and cost involved to retrofit such units would be much more expensive than buying new ones. I don't think any glass replacement companies would take the risk of trying to do this. No matter how you look at it your going to have a hefty price tag on replacing this glass. It's well worth the extra couple bucks to get a new IGU with LOE/Arg. The heat you see daily in Florida can be very extreme. By not having the protection of LOE film & some type of inert gas such as Argon or Krypton, you'll spend more money trying to cool the heat that will bypass clear glass. LOE or Low Emissivity coating blocks heat loss through normal clear window glass. It substantially increases thermal window performance while maintaining the appearance of uncoated glass. It reduces summer heat gain, and is also known to reduce the harmful ultraviolet rays, which cause fading of interior finishes. The coating reflects 40% to 70% of the heat that is normally transmitted through glass, while allowing light to pass through. To see if you have a LOE coating on your existing glass just wait until it's dark out and grab a lighter. Hold the lighter up to the glazing unit and observe the reflections of the flame. There will be one reflection for each surface in the glazing assembly. A single pane of glass will have two reflected flames and a simple two layer insulated glass will have four reflections etc... Any surface with a low-e coating should reflect back an image of greater intensity and a slightly different color than the rest. Noting which reflection has shifted in color will tell you which surface is coated. Try the same experiment from the opposite side of the glazing. This should confirm your identification of the low-e surface. These reflection effects are the result of the fact that low-e coatings are somewhat more reflective than glass alone across the spectrum and so will appear to reflect back an image brighter than the other surfaces, and because they selectively reflect greater amounts of longer wavelengths and so they reflect back more red. This second effect is more noticeable in some coatings than others. Hope you understand this and it helps you out in some way. Good Luck!!!

I appreciate that information. In fact I'm sure it will save me many $$$ now and in the future. My most substantial error was in calling Andersen, whose rep told me to replace the sash (not just the pane) in order not to void the warranty. The window is their model C235, and the visible glass size of the broken pane was 19 5/8 x 31 3/8, so paying $800 to replace the sash instead of a piece of glass seems wasteful, Since Andersen puts their breakable panes on the outside instead of the interior, I can see a similar issue coming up again. A 2x4 was used in the attempted break-in. The exterior pane shattered easily, but the impact-resistant inner pane came through without any damage. Thanks again.