Jmatt,
This is a scam. If you check this guys handle on the other site, you will see that he has contacted almost everyone about bow sales. Usually he wants your name, phone # and address. He usually only corresponds via text. My theory is this guy may be selling peoples information for email/text marketing or worse.
The problem with cashing the check is that if you send the bow, the check may not actually clear for up to 14 days. The bank will contact you and inform you the check didn't clear and you need to repay those funds. If he sends you a usps m.o. and you feel like cashing it and sending the bow to him, I would recommend taking the check to the post office to have them inspect the check before cashing it.