Hi @GaryBusey1 ,
Since you are shipping from Canada, have you checked the Shopify shipping discounted rates for Canada Post, FedEx and UPS? Normally, they offer good discounts for all the domestic and international shipping. However, if you are looking to partner directly with the carriers (which is the best option for long term), negotiating lower shipping rates for carriers like FedEx, or UPS can be done by establishing a relationship with the account manager and asking if you can discuss a discounted shipping rate for your account.
Neither FedEx nor UPS publishes volume threshold rates, so negotiations for discounted rates work on an individual basis. If you aren’t considered a company with high-shipping volumes but, you’re showing a significant increase in sales, UPS and FedEx may extend a three-month period which will allow you take advantage of lower negotiated prices.