App Selly can help you offer bundle or quantity discounts:
Thank you for your suggestion, but I'm not sure that app is going to offer what I need.
I want my customers to be able to select a specific amount of items from my product range, based on a deal or promotion.
I.e. pick any 3 items from our range for £10.
Customer then selects the three desired items from the product range or list of valid items, and the deal is automatically applied.
Is there such an app? It seems crazy that there isn't one I can find. Lots of people asking for this feature.
I'm not sure I understand your need correctly, but I think related items or things people would buy together would be much better than random ones. Because some items in that bundle might be unnecessary for them. So they might take separated or just one item instead. If you need a sincere recommendation, I would introduce the Upsell Cross-sell smart tool by Autoketing. Hope this would help. Cheers!