The links below will not add anything to the cost of your test, but will contribute (small) amounts to the sites I find of ongoing usefulness with DNA work.
If you want to help WikiTree.com:
Use this link to order from FamilyTreeDNA, from where you can transfer your FamilyFinder file to GEDmatch and MyHeritage for free to fish in more ponds for that elusive relative with the family information you want.
To help DNAGedCom.com develop more tools
eg for easy downloading of your files from the assorted companies +++
Use this link to upload your dna file from your testing company to MyHeritage – currently for free (Apr 2018).
No subscription required to see/contact your matches and use their DNA tools, which includes full triangulation.