It is hard to find a marinade for meat, poultry, fish, and vegetables that is a good match for a LS/LF diet. The maker of this one, Goya - "the largest Hispanic-owned food company in the US" has few LS/LF products. (There is a line of "reduced sodium products", but I have never seen them in mainstream stores.) But I really love this product, Mojo Chipotle Marinade.
This shows that you can make a tasty low salt marinade and sell it in a mainstream supermarket. (Goya foods are usually sold in the Latino food section of supermarkets and often all Goya products are grouped together regardless of their type.)
We recently had a group of 20 people over for an informal dinner. Two of those coming were vegetarians. We serviced grilled
boneless/skinless chicken breasts with grilled onions, portobella mushrooms, red peppers, green peppers, and zucchini with flour and corn tortillas fajita style. (Corn tortillas usually are low in salt and fat. Flour tortillas in mainstream markets vary all over the place in salt and fat content so shop carefully.
If you can't buy locally, here is a web-based source.