A supercertificate is a gc that comes from milesource and can be redeemed only at www.giftcertificates.com for online or offline stores. they amounts at milesource are 25,50,75,100,125,and 150. web certs can be spent anywhere that takes mastercard online and offline too if u order the web cert mastercard. I have one and at the time the fee was 6.95, and u fill it with freeride points(when it opens back in the fall), beenz (no more), blink, or mypoints. There may be more!