Flat Rate shipping on specific items

[Ollie]

My shipping charges are carrier-based for most products. There are some ADA Kits, however, that I need to charge a flat rate of $20 per kit. I tried both Default Free Shipping and Flat Rate Plus, and neither extension seems to work in my case. Any suggestions?

[AlvinWilliams]

I understand that your shipping charges are based on the carrier. Try to segregate all of them. It will help you find the exact costs for items wherein you can provide parallel products like keyboard +mouse combination.

[Ollie]

I understand that your shipping charges are based on the carrier. Try to segregate all of them. It will help you find the exact costs for items wherein you can provide parallel products like keyboard +mouse combination.

Sorry, I don't understand the solution you're proposing. I'd rather not use keyboard + mouse combination. It can be confusing to some people. The simpler, the better.