Non-threaded presta tubes

[Rush]

Can anyone recommend some non-threaded presta MTB tubes? (29er / 700c).

And tubes suitable for commuting (700c/37 ish) when I occasionally put slicks on it?

I use Michelin A2 tubes for the roadie (700 25-32) but the A3 model (35-47) has a threaded valve stem.
I find the threaded valve stems shred the rubber connection in my Silca floor pump.