L2.Net is not sold, it is given away for free. Even so, it takes hundreds of hours and lots of patience to make this program.
Walker cards are 7 USD per month per account. For one account that is 84 USD a year. Two accounts will run you 168 USD per year. L2.Net is infinitly cheaper than walker.
In return for your modest donation of 5 USD, you will be given an L2.Net Key that unlocks several donator only features.
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Donate 5USD