Most of the birth supply places I know of will sell you a boatload of unnecessary disposables in their "kit" - so if you want to go minimalist, you'll probably have to piecemeal.
Do you have a medical supply place (like for elderly homecare, what have you) around? If you do, I would call them to see about washable bed pads - get maybe 3 or 4.
Scout out your local thrift shops for old towels (or hit up friends & relatives) and sheets.
Drugstores have syringes.
For cord tying, 3 strands of embroidery floss braided makes a pretty cord tie - or Cascade has nifty metal clamps for the same price as the plastic 'sposie kind.
Find a good sharp pair of scissors to boil up with your cord ties.
Get a few pair of mens briefs that'll fit across your butt (my DH's worked for me), and some infant dipes - either pf, fitted, or contour, for you immediate postpartum bleeding.
Find some nice cushy WAHM Postpartum pads, and some large (overnight type) as well.
Then you just need your outfit & diaper or two, plus about 1 doz recieving blankets.
Wash everything. Pack the stuff into clean brown paper bags, close with masking tape, label with the contents, and bake in the oven (someone help me with the temperature & time here - I forget!) to sterilize them (if you believe that is necessary).
I had a bottle of Motherwort tincture that I used immediately postpartum - 10 drops under the tongue - to ward off hemmorage. And I drank bunch of Alacer EmergenC right after, too, while I was nursing Davey.
If you're planning a lotus birth, you'll want salt, rosemary, a little tote bag, and a couple bed pads for absorbnt liners.
That's all I can think of off the top of my head!