We're migrating to Shopify.
We exclusively ship our packages with USPS Priority Mail Flat Rate:
1. Padded Envelope
2. Small Flat Rate Box
3. Medium Flat Rate Box
4. Large Flat Rate Box
5. Regional A
6. Regional B
We'll be a Shopify Advanced Plan Customer.
I'm looking to price in Free Shipping to all of our products.
I'm looking to calculate/find a rate table to determine how much each box costs to ship via Shopify's Fulfillment System. We do NOT use accurate weight as some of the large boxes weigh up to 30lbs while others weigh less than 5lbs.
Regional Boxes are based on pricing from (Ship From Zip Code:94118 --> Ship To Zip Code: 10017)
Any help would be appreciated in finding this information.
Have you tried the Shopify shipping calculator for USPS and DHL?