Older macs value?

My dad is on hospice and my mom and I are going through his stuff and he's got some old (2006-2008) Macs. I'm trying to see if there any sort of resale value for any of them or if I should just take them to the Apple Store to be recycled. I have

A 2009 8 core Mac Pro

A 2008 Core2Duo iMac

A 2009 MacBook Pro Core2Duo

I'm guessing that all of these need to be recycled. However, do any of y'all think I could sell them for anything?