I got them special order from my local Christian bookshop many years ago... Might check Amazon to see if they have a used set...
See now, if you lived up here, y'all could just come on over and borrow them :D
If you are just looking for a read, I will lend them to you - but once you have them, I bet you'll want a set of your own... And the two volumes are about 3" thick (each). A very loooonnnng read.
Oh NOES!
Just went looking for Charlesworth for you and found out there is a second volume of OT Psuedepigrapha! Now see what you did? Now I have to go buy THAT too!
Vol 1 OT is available used in hardcover for $41.xx at Amazon... the NT volume seems to be hard to find.