@jpappy, I wouldn't bother. Regardless of the particularly hardy nature of the Lowes S. purps, I believe plants from TC don't really need dormancy for the first few years out of the flask (TC experts please flame me as necessary if I'm off base...)
But, I did transition some other plants from my grow rack to a dormant state last year. I took them out of the rack and put them in a sunny south-facing window last August, and left the window cracked to expose the pots & root systems to cold air. Temperatures were a bit too high but the plants did briefly enter a light dormancy... my Sarrs stopped producing carnivorous leaves and began sending up phyllodia and my D. filiformis formed a hibernaculum, although in both cases it seemed like a half-baked effort, again likely due to the temps. I can't tell you how successful this method was in the end, however, because I did not think to cat-proof my windowsill, resulting in an epic fail (as well as a gruesome puddle of cat puke with chewed up bits of D. filiformis and S. "Mardi Gras" leaves floating in it)