30 series 12 gauge barrel value?

I'm trying to gather a little cash for a new shotgun and have a couple, seldom used, barrels for my 30 series, 12 gauge pump and have no idea what they might be worth; that is of course, if I could find a buyer. One is a 28" full choke the other is a smooth bore slug barrel with iron sights; they're both in great shape. Does anyone know what they might be worth?
Thanks

What is the letter designation on the 28" barrel. I just picked one up from gunbroker for $30 to my door. Bore is great but the blueing was in need of a little work. Seeing them go from $15 to $160. I paid $150 for the entire gun, those higher priced ones seem a little much.