I tod you already in the comments to your previous question. yes you can but not in cash. Check money order. It is also written in the form instructions, which you seem to be refusing to read.
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Obtain a check denominated in US$ for the correct amount made payable to US Department of Homeland Security. Do not abbreviate DHS, they won't accept it. Attach the check to the petition and send it by FedEx or some way that you can track it. This is usually done by the US citizen petitioner in the US
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No. Check or money order.
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Sending cash is a very bad idea. If your envelope is opened by a scrupulously honest agent, they will reject it and send it back to you causing a delay in the process. If your envelope does not find that honest agent, you will still have a delay, but it will be an expensive delay.