Autosomal DNA transfer from Ancestry or 23andMe to Family tree DNA for a $39 fee vs $99 for a new test.
http://www.familytreedna.com/AutosomalTransfer NOTE: Pay the database fee and join a project, like getting a full new test without paying the full cost of a re-test. All three companies use the SAME testing machine, but do not share databases.
Autosomal DNA transfer from Ancestry, 23andMe or Family Tree DNA to GEDmatch
Create a free GEDmatch account: http://v2.gedmatch.com/login1.php Follow upload instruction for your DNA data file.