Between resistance bands, a mat, a stability ball and dumbbells, you've already got most of the elements of basic home exercise equipment.
However, I wouldn't bother with the 2 and 3 lb weights - they are too light to genuinely challenge your muscles or to provide effective strength training. (And this would apply to the 5 lb weight too for many exercises). I'd recommend moving up to heavier weights. You should be aiming at a weight that is heavy enough to completely fatigue your muscles in 12 reps or less (the fewer the better). An adjustable set of dumbbells may provide better value than a full range of fixed weights.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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