From a FB group I'm on:
Lowes
• PolyPro Foam Insulation (0.5in x 48in x 96in) -$10.98 each x4
• 3M Foil Tape- $6.98 x2
Home Depot
• Suncast Stow-Away 3 ft. 8 in. x 5 ft. 11 in. Resin Horizontal Storage Shed-$469 x1
• Concrete Blocks 4x8x16- $1.37 x30
• Everbilt Return Air Grille 16x16 -$22.65 x1
• 3in B Vent pipe (3inx24in)-$18.63 x1
• 3in B Vent Cap-$15.28 x1
• 3in Firestop Support- $12.98 x1
• 3/4 in. x 24 in. Black Steel Pipe- $11.51 x1
• 2 Gang weatherproof receptacle cover- $21.36 x1
Amazon
• 1" Thick x 12" x 24", Fireproof Insulation Blanket- $ 22.90 x1
• SUNAPEX 10W 12V Portable Solar Battery Charger & Maintainer - Solar Panel - $29.99 x1
• iPower HIFANXEXHAUST12CTB 12 Inch Variable Shutter Exhaust Fan with Speed Controller and Power Cord Kit -$69.99 x1
• Titanium Exhaust Black Wrap 1" x 16' Roll - $9.99 x1
O'Reilly Auto Parts
• Walker 1-1/4 Inch Diameter Steel 12 inch Pipe-$4.29 x1
• Nickson 1-1/4 Inch Steel Exhaust Clamp-$1.99 x 2