Get It Now From Staples
Half a terabyte for $50, who would've thought. But here it is, the Maxtor Ultra SATA II internal drive is on sale at Staples for $64.99 - $15 instant coupon = $49.99 with free shipping.

If half a terabyte won't cut it for you, you can get two of these drives for $100 - a $25 off coupon (search Google) = $75 with free shipping for 1 terabyte of SATA II storage.