This should work, check it out:
Starting Sunday, Staples has the 120gb hard drive for $79.98 after rebates.
Today, Staples has the 120gb hard drive for 139.98 without any rebates.
So you should be able to buy the hard drive tonight for 139.98, use a $20 off $100 coupon, bringing the price down to 119.98.
Call Sunday or Monday or whatever, say you wanna do a PM to the new Staples price, which gives you a refund of $66.
So $139.98 - $20 - $66 = $53.98
Staples ad price for Sunday
Tonight's Staples hard drive price
edit: for more linkification
Starting Sunday, Staples has the 120gb hard drive for $79.98 after rebates.
Today, Staples has the 120gb hard drive for 139.98 without any rebates.
So you should be able to buy the hard drive tonight for 139.98, use a $20 off $100 coupon, bringing the price down to 119.98.
Call Sunday or Monday or whatever, say you wanna do a PM to the new Staples price, which gives you a refund of $66.
So $139.98 - $20 - $66 = $53.98
Staples ad price for Sunday
Tonight's Staples hard drive price
edit: for more linkification