Work out the cost per use
A box costing £30 with ten treatments costs £3 per use. Do the same sum for every product you are considering.
What else to compare
Then consider formulation, manufacturing quality, number of patches, packaging, comfort, ingredient transparency and brand support.
Value is personal
A £2 patch you dislike is not good value. A slightly more expensive treatment that becomes part of a routine you genuinely enjoy may be.
Luxury should feel meaningful, not inflated.