Peel & Seal is a brand name of a roofing material. Not all locations have that name, but all Home Depot's carry something equivalent. The one in my area carries a product called QuickRoof. For roofing (what it's made for) it's the same stuff. For sound deadening, the different brands have diffeent thicknesses and adhesive qualities. Some of them ****, some don't.
Bottom line is that you can't be guaranteed that Peel & Seal is gonna be there. Best shot is to email the Peel & Seal rep in that area and see if they know.
From their web site http://www.mfmbp.com/peelseal/ the rep is
US Building Products Inc.
432 S W Ward Rd Suite #201
Lees Summit, MO 64081
Attn: Steve Rash
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
Sub Stage: Boston G3 10", 0.5 cu ft sealed
Amp: PPI Phantom 900.4
Rear Fill: Boston SE953 6X9's