Groupings of products

Hello,

I have to be able to offer a discount when someone buys several items together as a kit. Example, I have 5 different size items and I would like to offer a discount to encourage customers to buy all five. However, I do not want to create a new item for the set of 5 because it will create and imbalance in my inventory and I will lose track of how many of each item I have left. I want the quantity in stock to show the lowest quantity in stock of the five, and when one kit is purchased, the quantity of each of the five items would go down by one.

I already looked at the available plugins and none addresses this. The "Better Together" one only allows for two items together.

My client is willing to pay for someone to develop this if it does not already exists.

Any suggestions?

Thanks a lot!