Options Wonderland

[hoticetea]

New to option trading(question)

I never trade option before, just learning. I have a little over $10k in my tdameritrade account(margin, & long option trading). I tried to place a put order for PCLN(PUZXR 90 Put) today, but the TD's online trading system rejected me with the following message:
"Your order was not accepted. Funds are not available for this transaction of non-marginable security."

I contacted TD, and this is the email they replied.
"Thank you for your email. I am showing that you are entering an order to purchase 288 contracts of +PUZXR at 1.80 per contract. In order to place this trade, you would need $51,840 in available funds for the trade and $221.00 for commission charges."

But I thought I should only pay $518 for the contracts, and $20 for the commission. Is this right?

Any help will be appricated.

hoticetea