The Yamaha DTExpress is the lowest cost kit (at $1,000). They are not bad sounding, but I've found them to be somewhat frail.
You may be able to put together a set of Hart pads and pick up a used Alesis module (D4 or DM5) and save maybe $200-$300.
You could build your own pads - but by the time you pay for the materials and put in the sweat equity it may not be that much of a savings.
I don't hate e-drums as much as some of the people on this site (maybe because I've played e-drums on and off for almost 20 years).
Certainly I prefer an accoustic set, but I think a low cost e-kit (like the DTExpress) sounds better than a low cost drum kit. However, for $1,000 (the cost of the Yamaha e-kit) you can get a pretty decent accoustic kit.
It all depends on what your looking to achieve.