Well, they go from about $1,400 to $3,000. Not something I can justify in this business climate.
But what's more, Photoshop CS6 and other versions can do the same thing, at much less the cost.
What an architectural lens does is get rid of the slanting walls when you take a close shot of a tall building...like this:
The photo above I found on the web somewhere. I put it through the Photoshop filter called Lens Correction, used the custom setting so I could control the Vertical Perspective and Horizontal Perspective, and did a little with the Vignetting. If I had taken another 15 minutes, I could have made it perfect...but you get the idea. It's just a matter of tweaking the technology of Photoshop.
So I officially present myself as an old dog who can still learn a thing or two!