Step 2 is available - 10% off $200 when redeeming eSuperCertificate, this offer is on their home page, code 10poff200
Takes some effort - clear cookies, you might have to make one incomplete transaction and cancel out at the end to get coupon counted.

Do not redeem more than $300 in one transaction - that adds an extra fee.
Also, make sure that amount you buy don't exceed GS's value - extra fee again.

Overall, there're unlimited number of possible click variations, but at the end you can get 25% off easily