Fixie Bike Shops

Arrospok?
fiddy dorras.

Or

aerojoke
If you have the money spend it.
If not, buy a regular wheelset, which is less expensive and stronger (and i don't think I'm wrong in saying occasionally lighter), and IMHO a lot nicer to look at.

In a stiffness test (deflection measurement) of 140 wheels - from Rolf Vectors to Spinergy, from Shamal to Bontrager Racelight - Aerospoke come dead last.

It is simply the flexiest wheel out there.

It is also amongst the heaviest.

Example:

Front Aerospoke 1200g
Stiffer, Cheaper and more readily available DT Swiss Mon Chasseral Front 660g

It is worth noting that flexy heavy wheels are slow wheels.

Eyebrows is right in saying that of you want a lighter, stiffer, faster and cheaper wheel a - regular build would be best.

If you are after the look of the thing (and I also think they can look great on the right kind of bike) go for something like a Hed3 (the thinking man's arrospok™) - more expensive but you get performance as well as having a nice looking wheel.