Here is another one you can add that I have found works with sales that I make (although those are big ticket sales).
Attach some proof of what others payed in higher prices. As in "10 people paid $x for this last week".
Attach some proof of what others payed in higher prices. As in "10 people paid $x for this last week".
Pricing strategies are one of my specialties and I use them in negotiation almost every day.