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Pack size changes the price per feminized seed more than most people check. On the listings I looked at, five seed packs run from 9.80 to 13.80 per seed, while the ten seed mixes drop to 8.90 and 9.90. Those numbers come from the strain cards at https://queenfeminizedseeds.com where the per seed figure is printed under each pack price, which saves doing the division yourself. Bigger packs only make sense if you will actually store the leftovers properly, otherwise the saving dies in a drawer.