This will sound dumb, but any sample is a "best buy" because I usually buy blind and those allow me to eliminate a lot of bad choices.
Anyhow... $7 for 1.7 oz Shalimar EDT
$7 for 1.3 oz Guerlain Vetiver
$7 for 1.7 oz XS
$7 (sounds like my lucky number) for 0.5 oz each of Lagerfeld Photo, Classic, Cerruti Image & 1914 (or whatever that number is)
BUT... Anything I wear regularly is comparatively a bargain. Anything I don't is not, even if I got it for cheap.
So, though this won't sound like a bargain for most people, but I got 4 oz Bois du Portugal for $70. I also have knock off Silver Mountain Water oil for $10, and it is a dead ringer for the stuff. The other oils I have are not quite up to snuff.