Actually USPS only allows 3 packs to ship in one box. Due to this we only use USPS small flat rate priority. For UPS we use ground and use flat rate shipping to keep things easy. So we start at 11.50 and then increase 0.50 per 2S pack and 1 dollar per 4S pack. We can ship 3 day , 2 day or next day using UPS but we need to do this manually so the customer must email us.

We also have the following info when in the shopping cart.

Shipping Info:

For one or two 2S packs you have the option to use USPS small flat rate priority shipping or UPS. For 3 packs or more UPS Ground is the only option. For those who require faster shipping please contact us for pricing and options.