rear main seal or valve cover gaskets leaking??

[1972BlueC20]

I'm getting oil droplets on my driveway....I thought the valve covers where leaking and maybe they are still. They were very loose so I tightened them up and didn't see any more droplets for a few days. I cleaned up the engine below a little so I could see where it was coming from. It does look like the valve covers were leaking or are still leaking. There is oil from the spark plug area all the way down and back...

I did an oil change the other day and wiped the bell housing off real good and the oil pan.....now I got droplets all back on the bell housing.

Does this sound like a rear main seal? or?

How much should a rear main seal job cost from a mechanic shop?

I just need a reasonable ballpark so I know I'm not getting ripped off when I go to get quotes.

I'd do it myself, but I don't currently have the equipment or proper space.