If you order 2 packs from SMC they go USPS select. 2-3 days for most people.
If you order more than 2 they go UPS ground, depending on how far from VA you are it could take up to 7 days.

The 30c 5000 SMC should be more than enough for a SC10. 32.00 and you get
to choose your plug. Unless you have a good reason to run 4mm plugs stick
with a Deans or Traxxas connector.