What is the initial display price of the bundle?

The initial display price is the first variant of the linked product. By default, it's set to $100. This price is only shown on the collection and your theme controls it. If you're using:

1. The default way of dummy variants:
   Usually, the theme shows the lowest variant price. When the customers build bundles, new variants are generated and this displayed price is replaced by the lowest variant price. 
2. Pair with discount code(s)
   The displayed price always shows on the collection. This is because no variant is generated. In other words, the 1st variant price of the linked product is shown on the collection.