Well I did a little research and came up with some info. There are actually 3 rebates on this drive when bought through Amazon.
Go to
this site, which is the site you use to redeem these rebates, and then do an advanced search. Then select Amazon.com for the retailer, and put AGT4-25SAT3-128G in as the model number. It will bring up 5 rebates for the drive, 3 of which are still active(though one expires today, Sept. 9th). One is an "up to $30" the other two are "up to $20". However, one of the rebates on Amazon matches one of the 3 rebate numbers on that site, the one that expires today, so we know that rebate nets $20. The "up to $30" rebate's PDF form can be found
here, and it say it gives $10 back on the drive. The other rebate I wasn't able to find PDF form on, so I'm going to assume it gives $10 back. That would total $40 off on the drive, if you don't mind filling out and waiting for 3 rebates.
Edit: When I select the details for the 3rd rebate that I couldn't find a PDF for, it says the rebate is for between $15 to 20. That means the total is actually $45(possibly $50) in rebates for this drive, bringing the price down to $30(possibly $25) per drive! Also, each rebate can be used multiple times, I think the $20 limits to 3 uses(the other 2 rebates can be used more times), so you can get up to 3 drives for $30 a piece! Damn good price if you don't mind jumping through the hoops and waiting for the rebates.