Topdser has the feature to auto sync to Shopify product when product/variant no longer available or cost has changed.
1. Please login to Topdser, then click the “Settings-Settings “, you will see the page of the product updating setting.
2. If you choose “do nothing” , it will not change your Shopify product when product/ variant cost changes or product/ variant gone from supplier.
3. If you want it to update and get notification automatically, just click “Set Quantity to Zero “and "Update Price and Compared at Price".
4. If you choose "Notify Me", you will get notifications when product/variant no longer available or cost has changed.
Also when you browse "Your live products" list, there's a highlight and you will be able to choose whether to update price or not.