We sell products that can vary in price based on the quantity the customer buys.  1 target is $1.00 each.  A box of 200 targets is $100 or $0.50 each.  If it makes a different, the boxes only come in 200.  What is the best practice here to set this up.  Do we set up Quantity (Each and Box of 200) as variants or do we use the Product Packaging Feature (Box of 200) in the product module.   I am unable to find a way to set a sales and purchase price for the Product Packaging, and wanted to confirm that this scenario would require the use of variants?  I appreciate any insight.