Can you purchase items from a pawn shop online?

Must be 18 years or older with valid I.D.

That depends on the contract. You should have received a copy when you pawned the item.

i have bought at 12

Less than you would like, but more than you had before.

You can use cash online if you have a way to send it electronically to the merchant, for example Paypal or Western Union can be used to transmit payments.