Value of Benjamin bullpup with moderator?

I have a new in box Benjamin bullpup .357 and a never installed mega moderator from pitbull airguns. What’s a good price to ask for this?

*MOD EDIT, PLEASE BE CAUTIOUS THAT THIS TOPIC DOESN'T BECOME AN ATTEMPT TO CIRCUMVENT THE CLASSIFIED FORUM. I SUGGEST DOING A SEARCH IN FOR BENJAMIN BULLDOG IN THE CLASSIFIED FORUM. OR A GOOD RULE OF THUMB IS 20-30% LESS THAN RETAIL.
 
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I think you meant benjamin bulldog, not bullpup. If it's new and never use. Why did you buy it and sell it? Doesn't make sense since someone would just buy new from a trusted retailer than buying from some random guy claiming its new. I would understand it if its used and you wanna sell to fund a new gun. If you are a trusted retailer than you can still sell as new. But as a random guy, you can only sell as used since it is a 2nd hand gun now. The price usually 25-30% lower than getting from a retailer. I checked and on Amazon its $777 with free shipping. So it would be $583-544. But it all depend on the market and who is willing to buy a used bulldog for that amount.