Try calling sweeps. Stove shops are more concerned with keeping install prices down to sell more stoves than anything else.I have called every BK dealer in NY, CT, and NJ.
They ALL told me the same thing that they don’t use blanket or preinsulated liner. One dealer/installer in NJ told me exactly the same thing Captain Soot told me that preinsulated liner is needed in up North or in colder climates.
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https://codes.iccsafe.org/public/document/IRC2015/chapter-10-chimneys-and-fireplaces
Read r1003.18
It describes the required clearances. It then says you dont need those clearances if you use a ul 1777 liner listed for use in chimneys without clearances. No liner is listed in that way without insulation.