The short answer is no. Sending a physical letter always involves some cost whether you send it yourself or through a service like InmateAid.
If you send a letter on your own you need paper, an envelope, and a stamp. First class postage currently costs around $0.68 per ounce. That is the minimum cost of sending any letter through the United States Postal Service regardless of where the facility is located.
If you send through InmateAid the cost is part of a letter package, currently 8 letters for $8. InmateAid handles the printing, materials, and postage on your behalf so you never need to worry about stamps or finding a mailbox. Your letter is composed online and mailed directly to the New Jersey facility from your phone or computer.
There is no way to send physical mail to an inmate completely free of charge. Anyone suggesting otherwise is not being straightforward with you.
What is free is the writing itself. Composing a letter costs nothing. The expense is in the delivery.
If cost is a genuine concern InmateAid's letter package breaks down to $1.00 per letter which covers printing, quality materials, and postage. That is roughly the same as buying a stamp and an envelope separately with the added convenience of sending directly from your phone.
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