“distress purchase” refers a purchase made at some critical point, usually during a failure, traffic leap or other unplanned event.
For example, your traffic profile has because the new Sharepoint installation, the number of TCP sessions has increased by 40% overnight and rolling back Sharepoint is not an option). Management suddenly finds a massive wad money from the budget and you give the purchase to anyone who can deliver the kit today. No haggling, full price. Thats a distress purchase.