Hi PT, there is no minimum purchase for this product. The price listed is for one (1) bag of landscape rock mixture that covers 0.50 cu ft.
I really don't know. I bought 10 bags for a smaller area. Maybe you need about 20 bags .depend on the project area. I just put mine around a small flower bed. To keep down weeds.
Hi Ken, thank you for your inquiry. Unfortunately this item is currently item of stock and our vendor has not provided an estimated time of arrival. However, if you would like to be notified with updates on the status of this item, you can enter your email address into the field provided on the product's page. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot!