Nope, no Semroc at The Prop Shop in Warren.
They have pretty much the entire Estes line and a smattering of odds-n-ends ages old Aerotech kits and that's it. No Semroc, Quest, or any of the other smaller brands either. NOTHING at ALL for High-Power either.
A very good point about the Prop Shop though is they carry the full color line of Brodak Butyrate Dope, which effectively replaced the Aero Gloss line years ago; comes in at least 3 times the colors ever offered by Pactra to boot.

Rider's Hobby in Madison Heights used to carry PML, LOC and other HPR brands, but they closed like 5 years ago with all their stock moving up to the Flint store. The rocketry selection at Rider's in Flint absolutely stinks. That hobby store is more of a glorified high-priced toy store than anything else.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !