Maximum Intensity Cardio (MIC; on the same disc as Rhythmic Step and Interval Max); has a 35-minute hi/lo warm-up and cardio section that is very, very good;
The Cross Train Express (CTX) series; two of the five workouts with cardio components have hi/lo, and another (CTX Kickbox) is . . . well, kickbox; the 10-10-10 workout has a kickbox warm-up and brief cardio section;
Cardio Kicks (on the same disc as Circuit Max); good kickbox-inspired floor cardio and a really good power drills segment at the end;
Step Jump Pump (SJP; on the same disc as Step Blast); has a 19-minute hi/lo premix; the SJP workout as produced has 4- to 5-minute hi/lo cardio interspersed with weight circuits;
Boot Camp (on the same disc as Muscle Endurance); all of the eight cardio cycles are floor (no step) and there are cardio only and kickbox only premixes;
Drill Max; two of the cardio segments do incorporate the step but you can always substitute floor cardio moves of choice or skip those segments;
If you're interested in other workout producers, Mindy Mylrea has a 2-workout disc called "DVD Combo", which has two full-blown workouts; one of them, "Action Packed" has a stand-alone hi/lo segment and the other workout "Interval Express" has a 10-minute hi/lo segment; Mindy also has a new release called "Kick Butt Boot Camp" that has a 20- to 25-minute hi/lo segment with med ball (which I happen to like); it also has a kickbox segment that is seriously not very good IMHO.
HTH -
A-Jock