Just offer any amount on the grips, I'm not selling em to make money just don't need em anymore.
There will be no "auction-style" selling here.
If you post an item for sale and it says anything like "I will take the highest offer" it will be removed. If you want to run an auction, take it to eBay.
Actually early wedding anniversary gifts, my wife got me all of it. I'm waiting on a new taillight too so once I get that I'll be selling the stock one.