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It depends on how long you're willing to wait and where you live. If you're in the north with long winters, seeds from online will make you lose an entire season before the plant becomes productive, while at a nursery you'll already find ready-made seedlings that might start giving you strawberries within a few weeks. If you're in the south instead and you're not in a hurry, seeds cost really little and anyway perpetual strawberry is a plant that reproduces easily once it takes root. The real difference is timing and your climate conditions, not the price.
It's not really such a clear-cut choice, it depends more on what you're looking for: at the nursery you find plants that are already established and produce right away, while seeds online cost less but require months of patience and there's no guarantee they'll germinate well.
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