The plain-envelope shipping method that fits 30-plus bulk cards in one envelope (full technique in the cheapest way to ship bulk) lives or dies on knowing the exact weight before adding postage. A one-ounce stamp covers less than most people assume once a stack of unsleeved cards and a team bag are factored in, and guessing wrong in either direction costs money.
What to look for
- Accuracy to at least 0.1 oz (or a few grams). Postal weight brackets are tight enough that rounding matters
- A tare function, to zero out the weight of an envelope or mailer before weighing the contents
- A flat, stable platform big enough for a stuffed bubble mailer, not just a small parcel
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Typical price
A basic digital postal scale, more than accurate enough.
$15–25
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Weight, 30 unsleeved cards
The real number that decides how many extra stamps are needed.
oz~2.6
Why this pays for itself fast
Overpaying postage by even one extra stamp on every bulk order adds up quickly at volume, and it's pure margin lost on cards that were already priced to be worth the shipping effort in the first place (the same floor-price math covered in is selling bulk actually worth it). A $20 scale that removes the guesswork earns itself back within the first handful of orders it's used on.
Shop postal scales on Amazon → (paid link) See the full envelope technique →