well, that might be hard to find but check out @Camera House or if you dont mind the wait try buying it from @Cash Basha you might as well check @Tech Town if they have it..

Where can I find a batman Keychain/Necklace?

Maybe you should order it from @Cash Basha

Where can I buy a cheap piano keyboard?

You should just order it from Amazon way cheaper wallah... Its like 200 JDs if you order it thru @Cash Basha try it your self and get the ones on sale right now ... your order will be in amman within 10 days

Where can I find mildliner zebra highlighters?

it might be hard to find them in jordan .. you should order them from @Cash Basha

Where can I find a place to order stuff online that has everything?

Depends on what you need, a lot of people order from @Cash Basha or @EXXAB, if you tell me what you need specifically i can direct you to a better website

Where can I find Sephora?

order it from @Cash Basha , when it comes to make up brands i always buy from there

Where can I have a credit card to buy from amazon?

You can buy directly from @Cash Basha without a credit card if you want, you just pay cash on delivery.

Where can I find a dinosaur's costume?

Did you check out or @Party in a Box ? If you didn't find what you're looking for, you can easily order it off of @Cash Basha . Best of luck! :)