New they're probably $400 or more.

Used, if you don't want them and he'll give you something north of their weight x scrap price sell them to him.

They're really nice fountains if a guy must have pigs outside.   The thing is most guys that still have pigs outside already have good fountains.

They don't sell for much on sales anymore.

Here's an ad for new 4 hole fountains for $300, looks like he's got several.    This same ad has been in the same paper for several years, I'd bet he'd be open to offers.

http://www.farmcountrytrader.com/Ads/for-sale.cfm/Keyword-smidley/