Bundle App for X+Y that looks like quantity breaks

[D_W]

I sell products that require specific batteries to go with them.

When I sell a product, I would like the customer to be able to choose how many batteries to get at the same time, with a lower price per battery the more that they buy. 

I would like it to look similar to the quantity break offers in many of the apps.

For example, on the product page

Product + 1 Battery $50

Product + 2 Batteries $70 (Save $10)

Product + 3 Batteries $80 (Save $30)

There are two solutions which almost get me there.

I can create them as variants, but then it is very difficult to track inventory.

I can create a bundle page, but I would prefer it to be on the product page like the quantity breaks are.

Are there any apps that do exactly what I'm after? I've had a look at many bundle apps but couldn't find any.

[Risa]

@D_W 

App Selly can help you to set up the 3 bundles:

https://treedify.com/selly-hi

In bundle setting, you can select the "various discount" option and set discount applied to batteries.

There are also display options and quantity box display option in bundle setting, so you can decide to display bundle or not, display quantity box or not.