Best App/Software to Link Shopify to Amazon??

I have been using Sellbrite to link my inventory and pricing to Amazon and then send my Amazon orders back to Shopify. Sellbrite hase been screwing up my inventory levels and when I make price changes on Shopify Sellbrite isn’t always reading the changes and sending the updates to Amazon.

Anyone know of any other software or integration that can get this done for me?

I would also need it to be able to modify the price. For example, I use pricing templates on Sellbrite to increase certain items a specific $ or % amount.