Zoro shipping is free over $50 order, otherwise I think it's only $5? I generally just batch, especially with the way they rotate promo codes. I've always got some slow-roll projects going on.

Time frame it really depends - delivery dates a day or few days out are generally accurate. Most items they stock at a local distribution center, so I get them next day. Some things come from further warehouses of theirs and take a few more days. There are also third party vendor items that are all over the place for delivery time, but you know those by their estimated delivery time being more than a few days out, and saying ground shipping only. (They're slowly taking away "free shipping" from items that require LTL though, heh heh)

For fasteners specifically, their parametric search has gotten better. I'd have Digikey's interface everywhere if I could.