For 50$, is it specified what you will receive? The important thing is to know before you pay, and not assume that it includes full insurance and decent packaging (I know this the hard way).
I would ask the seller if the shipping cost includes full insurance, tracking, signature confirmation (if available), and if they could please package securely, if any of these things aren't stated in the listing. The type of shipping may be on your invoice, that will give you more information also (e.g. if it's fedex). I make international purchases and worry about packaging/insurance. For expensive items I usually send a friendly, courteous email for reassurance if I'm not sure how it will be sent.