The best discount code for spacefisharmy.com is 'cosmik', which provides a 10% discount. There are also other codes available such as '4VB7' for a 10% sitewide discount and 'Q5VU' for a 5% discount on the purchase of Spacefish Army Rash Guard. Please note that these codes are subject to terms of use and may have an expiration date. It's recommended to check the validity of these codes on the website before making a purchase. Happy shopping!