This topic came up once before, and there were a suprising number of comments against the Greenlee kit. The general consensus was that the Amprobe was great and the Greenlee was a good doorstop.
I didn't see the option to buy just the transmitter on Grainger's Web site; they have the AT-2005, which is what I already own. I only need the T2200 transmitter unit, not the whole kit, which costs $1000. I'm not about to drop another grand just for the transmitter.
In addition to the current job where I still need to find the short, I got two more calls today about short circuits, so I couldn't wait on Amprobe to repair or replace my transmitter (still under warranty), as I'd have to get a return authorization and mail the transmitter to Florida. I'll still pursue that, but in the meantime, I bought the supply house's last Ideal 61-956 kit today for $581 with tax. It's the same as the 958, but it doesn't have the clamp attachment for inducing a signal on a live wire. My Amprobe kit has one, but I have never had a need to use it.
I'm going to read the manual on the Ideal tonight since I have to find that short circuit tomorrow. I'll report back on how the Ideal compares to the Amprobe.