For a fixed per-unit budget the allocation that consistently performs best is: adequate diameter, honest material, full-specification cord and termination, and then whatever remains into packaging. The instinct to spend on furniture or on a larger diameter at the expense of the box is usually wrong, because the box is what the recipient encounters first and what stays on the desk afterwards.
The allocation that consistently performs worst is a large diameter with thin cord. It produces the most impressive photograph and the highest failure rate, and the failures arrive a year later attached to the organisation’s name rather than ours.
We will model two or three allocations against your per-unit figure and say which we would choose. That takes an hour and it is the single most useful thing we do for gifting programmes, because the difference between allocations at the same budget is far larger than the difference between suppliers at that budget.