I agree with Annethcz...
I have a full dozen chux pads left over after my last birth. The alcohol, witch hazel, etc all were over kill. We needed a cord clamp, the birth cert was a nice token but unnecessary.
Mostly, we used a lot of towels, a $1 shower curtain to protect the bed and a bowl for the placenta!
Still, if you have a midwife in attendance, I think it is respectful to them to have the things on hand that make them more secure with the birth. They've agreed to assist where necessary, and I felt like I needed to have whatever supplies she suggested out of respect for her. It wasn't expensive and it was fun to feel "ready."
Have fun buying supplies and daydreaming of your birth, but don't stress about it!