It's well over five years old; but as I said, it has never been installed and it is in absolutely brand new condition.
As to price, I would need to replace this with a Peco Electrofrog #5, and the best price I see online is $25.19 at Yankee Dabbler. I would suggest shipping USPS Priority: a small flat rate box costs $9.20 to ship. I would NOT ship in an envelope for fear of damage in transit. Call it $34 total.
If you do not want to ship Priority, I can't give you an exact rate without your ZIP code; but based on my experience shipping items I sell on eBay, I would expect regular postage to be close to $7 or so, and that does not include insurance.