Ready to pull out my hair over shipping mods

Hi,

I was wondering if anyone has their store set up similar to mine as in a combination of dropship products and products I make myself.

Here is one of my delimas. I offer sugar free cakes shipped by one of my drop shippers. That drop shipper only ships via UPS 2nd, ON and USPS Priority. When my buyer goes to checkout all of the shipping modules I have installed show up on the checkout screen. I have it posted in the details what shipping options should be chosen, however customers keep choosing UPS ground or other carriers not available through this dropshipper. I thought of doing zones, however it seems really complicated with three different dropshippers plus my own products. Does anyone have suggestions? Anyone else have a similar store set up and if so how have you gotten around this?

Thank You
Tina Fermin
A Unique Find Gift Baskets & Gifts/1-877-231-7873
A Corporate Gift Idea/1-888-219-1804
https://www.auniquefindgiftbaskets.com
https://www.acorporategiftidea.com

I have a similar issue here:
The shop offers sweets and other gift products and we have had a special service to deliver everything with flat rate to our area by home delivery (we haven't sold outside that area at all).
Now we would like to have also post office delivery added and it fits for most of products but we do also sell flowers and when the customer orders also flowers the webshop should give only the home delivery as shipping option since you can't really send flowers via mail!

Elli