I retailed audio gear for 9 years and I always gave a special price for packages, amp and speaker combos and even if one component was purchased. Here's how I price structured my sales. The retailer's sales guide for price lists had 3 prices.Unlike those super cars which are sold at MSRP or higher, the high end audio gear at silly prices probably has some wiggle room.
-Retail prices.
-Day to day non sale special prices.
-Super sale price.
So I was doing a lot of sales and was building a following of customers by laying down the straight goods about the gear and even walking people that said they would come back with the money for a upsell but they need months. They all came back too to my knowledge. So... I have 3 price options. I sold everything at super sale prices because having a customer come back for price protection due to me selling at different prices to me is embarrassing and I really feel like a wurm (sic). I even got flack because management knew I could do better. Here' my idea on the topic. I am the one talking and walking customers, I have the highest ever recorded profit margin on the home audio department gear in the company of ~700+ people ever and I am in top 10 to 12 % total sales for each month. I made the 2nd highest income in the store home audio department for years because I sold fairly and they came back and brought in friends and family etc. That is representing the customer, the gear and the manufacturers and really respecting the store and everybody's futures.