Typically when I do some types of applique I use a fusible ( heat and Bond, wonder under, steam a seam) but behinf the base fabric I use a tear a way stabilizer. The one I use tons of is a pellon product called "stitch and tear" . JoAnns has it and its on a bolt with all the interfacings .. some Joanns have the interfacings behind the cutting counter. And yes quilt shops will be open Friday , Saturday and most open after 12 noon on Sunday. You can search on line for shops.. and call and confirm the hours... and check many run some kind of sale over the holiday weekend.
If you go to JoAnns get the coupons and the flyer before you shop. Go on line .. and use the US zip code or city for the flyer in the area you will be going.