What I find amusing is the eBay listing from the original post suggests over 100 have been sold. You can buy these bridge rectifiers for maybe $1-2 a piece in small quantities and well less than $1 a piece at, say, 100 pieces.
So rename the bridge rectifier as an AC-to-DC converter for trains and charge $16.99 (plus shipping). As they say, America is the land of opportunity!