Create a Bundle builder on Shopify for our products

We have 10-12 products that we need to put onto our Shopify site as part of a bundle builder.

Some of the requirements of the bundle building include:

1. The items can't be sold individually
2. The bundled items will need to total a minimum price before a sale can be made (e.g. the total price of the bundle must be more than say £25 before the customer has the chance to make a payment)

We are looking for someone who can put this together for us, as well as, make it look great so that the customer has a positive buying experience.

We are looking for a good balance between cost and quality.

Kind regards,
Fiona