Looking for shipping extension that provides flat rate shipping

So Im trying to allow customers to place orders on my site, and I use Astoundify’s crowdfunding platform. I’ve installed Easy Digital Download’s simple shipping plugin, but I have encountered a problem.

When someone tries to add two unique products to their cart (as opposed to two options of the same product), they’re being charged shipping for each individual product. I’ve contacted them and asked about it, but there’s no way to charge one flat shipping rate for the entire cart.

So my question is, does anyone know of one that I can try? Something that can obviously be easily integrated with the crowdfunding plugin.

Any sort of response would be greatly appreciated.

https://www.ads-software.com/plugins/appthemer-crowdfunding/