How are you defining drift shells? Shells based on famous drifting cars? Like silvias etc?? If so, you'll find a few at the biggest hobby shop on the net, www.towerhobbies.com , HPI bodies are favoured as well, as they are quite faithful to the true shapes of the cars, they of course can be found at www.hpiracing.com , they have a very large selection, you would then need ot find a local stockist (which won't be difficult, HPI is one of the most well supported brands).

If you meant something else, let me know...