I know jemaher (TDT member) was looking to complete the #263 set — I've learned Strand Books has DTII & DTIII. I don't believe jemaher has posted in a while so if they're still interested, perhaps someone can reach out.

More info in the Google doc on this particular copy and, of course, a whole bunch of others. Would love to see some additions to the doc from other TDT members, too!