after an upgrade my partner has a system for sale consisting of:
camera body: Olympus E-PL1
lens: Olympus M.ZUIKO 14-42 1:3.5-5.6
2 batteries and battery charger
underwater housing: Olympus PT-EP01 with flat port (fits the 14-42 mm lens), including zoom gear for the above lens
base plate (sea&sea) with flexible arm - so you can attach your own strobe or video light
All is used, but in good condition and works perfectly.
This makes a great upgrade from a simple point and shoot camera to learn manual settings for underwater photography or as beginner system.
We got good pictures out of it, but it was time to become more serious. To be perfectly honest, it seems (on average) that we get more keepers out of our new cameras, but I believe this package still give a lot of bang for the buck. If used right, you can get great pictures out of it - it did produce a number of award winning pictures over the years (for example here last year: http://www.scubadiving.com/winners-2015-ocean-art-contest#page-4).
My partner is hoping to get about 400 USD / 350 EUR for the complete package, but is open to reasonable offers.
All gear is located in Norway, but we can send anywhere.
Let me know, if you have any questions. I´ll try to answer within short time.