You're better off just making your own. Experiment with different things until you get a flavor profile you like and then make it in fairly small batches to keep it fresh.

Most ground spices are only good for 6 months, and there's no telling how old that Lawry's or Johnny's was before it got to you.

I'd start with a 2:1 ratio of salt to spices. So if you wanted to make 100g of end product you'd have 66g of salt and 33g of your spices. I'd probably use some combination of Aleppo Pepper, smoked paprika, black pepper, onion powder, garlic powder, and either lemon or sumac for a bit of acid. I'd probably also throw in MSG, but most people are scared of it (In that example I'd add like 7g of MSG).

Some other things to try would be cayenne or any other hot red pepper, Worcestershire powder, sugar, mustard powder, cumin, fennel seed, fennel pollen, porcini powder, celery seed, or any herb you like.

A good place to start would be going to World Spice in the market. They have about 10 different pre-made seasoned salts. Taste/smell what they have, and look at the ingredients for making your own.

If you go your own route, make sure you write exactly what you did down. You are going to want to change things, and if you don't know exactly what you did, you won't be able to. Also invest in a scale that does metric, it will be your best friend in making blends.