Be careful with refurb units. I got my Blu Ray as a refurb, but as a factory unit. Third-party sourced refurbs could easily be older, outdated players that may have compatibility issues. I think the current UDF standard is 2.5. Most recent players conform to the 2.0 standard (around for a couple years) and can be upgraded via the interwebz or a hard patch on CD. Some, though, require return to the factory.
Also, the cheap (new cost) players tend to be slow and problematic. Think full minutes of startup time, menu access, etc.. They also tend to have very clunky interfaces.
You can get a really good new unit with built-in wifi for under a hundred bucks. I saw some at Sam's last weekend. The players on display were Samsung and Sony, but other mfgs have units in that same price range. Check out Amazon. Be sure to read the ad very carefully. A lot of players still pull the "Wi-Fi capable/ready" trick. Sure, the unit is Wi-Fi capable, but requires a separately purchased dongle to turn "capable of" into "can".
Finally, if you're thinking of running your Netflix through your new BR player, a word of caution. The Samsung player I purchased got rave reviews for the Netflix interface. However, compared to the xBox interface, the BR interface is slow, clunky, and frustrating. Pic quality is about the same.
Brad