Topher makes a good point. Coffee prices are going down, not up. We bought our first pallet of beans in January 2012, almost at the market's peak. I can't tell you what a difference today's prices make to our bottom line compared to when we started. So first question for your supplier is: Why the price hike? What is the justification?
If I was a retailer and you came along with a 3% or 5% or maybe even a 10% price hike I could maybe see the need for you to do so --- but you're talking, if I used my retail price for 227g and bumped it 1.85 euro, a 30% price jump. That's huge! If I was the retailer you'd really have to do a super sales job on me to implement that type of price hike. Face to face, not via email.
Finally, do you have other options for suppliers? All my suppliers are LOWERING their prices and have been steadily doing so for over a year. Your supplier is going against the logic of the market so I'd certainly get to the bottom of that before just accepting his price increase since it could very well negatively affect your business.