The L-enantiomer is actually readily available for purchase over-the-counter.

Vicks Vapor rub/inhalers and other decongestants use L-methamphetamine. The D-enantiomer causes CNS stimulation. The L-enantiomer causes only PNS (Peripheral Nervous System) stimulation, so it produces no euphoria or enjoyable effects.

Only unpleasant side effects, like tachycardia and anxiety, etc.

This is why racemic amphetamine/methamphetamine is so (comparatively) unpleasant, and the pure D-enantiomer is superior and "cleaner" feeling.

Racemic amphetamines have a much higher chance of inducing psychosis.