Yeah, there are at least 3:
1) Taylor Technology's K-2006 or K-2006-C (larger amounts of test chems)
2) Leslies On-line: FAS-DPD Chlorine Service Test Kit.
3) TroubleFreePools.com--their test kit.

They are all similar to Ben's kit, and all will serve you well.

The chlorine test is the FAS-DPD test. You use it to measure Free Chlorine (the good stuff) from 0.5ppm to 50ppm, or from 0.2ppm to 50ppm (uses 2.5x as much test chem). Then you use it to measure Combined Chlorine (the bad stuff). You add the two to get Total Chlorine (which is what your regular test kit measures).