DIY example, pricing. YMMV.
2-Gang Aluminum Weatherproof box, 3/4" hub $11.98
3/4" cord strain relief connector $4.25
Hubbell 5-15P hospital grade plug. $23.50
12/3 rubber cord sold by the ft 5ft, $10.25
15 Amp Industrial Grade Heavy Duty Self Grounding Duplex Outlet, White $10.61 This outlet also comes in gray.
15 Amp Duplex Receptacle/Outlet, Industrial Grade, Self-Grounding 5262- Specs. Very good outlet. Non plated brass contacts. Solid brass supporting back strap. NOT galvanized steel.
Legrand® Pass & Seymour Trademaster® Gray Nylon 2 Duplex Outlet Wall Plate
$1.76
Total $72.96 + tax.
Misc items $5
.