I'm left handed. Beside the above mentioned bullpups, I might be able to give a little more direction.
To start, the gen 2 Marauders have switchable bolts, the gen 1 marauders did not and the parts cannot be interchanged. All Marauders with a synthetic stock or adjustable cheekrest are gen 2. If the OEM stock is wood with no plastic cheekrest, it's gen 1.
I call the BSA Scorpion SE a "quasi-left" rifle. It has a fully ambi stock, and the bolt handle can be quickly detached and flipped over - I actually point mine upward to follow the profile of the scope bell. I call it quasi because you actually move the bolt action down and back rather than up and back. But the bolt has a pretty short throw, like ~40 degrees I think, and it feels natural very quickly. This arrangement also allows unimpeded access to the safety. If you prefer to go full left, you can order the parts from airgunspares.com to do so.
Some Daystate guns are lefty, but not all. The ones with electronic trigger mechanisms are easy to switch, but mechanical ones like the Daystate Huntsman or Air Ranger are a little more challenging. The Huntsman comes in a full left or full right hand stock, not ambi, so that seals the deal pretty quickly. The Air Ranger has a nice ambi thumbhole stock, but the internal mag indexing bar and bolt handle have to be changed for full lefty. If you shoot it with the single shot tray you might be able to do the "quasi-left" arrangement I did with the Scorpion SE, I haven't tried it. I believe you can also get the conversion parts for daystate from airgunspares.com, or probably AoA as well.
For something a little cheaper (and less power), you can get a Prod or Crosman 1720T which have convertible handles like the gen2 Mrod, and put a stock on it for a light and handy little carbine. Or you get a Disco or maximus, and get a fully left hand multishot breech from BNM. I think someone else makes one too, but I don't remember who.
And if you keep an eye on the classified ads, once in a great while a nice lefty rifle comes up. Not long ago I had to pass on a lefty FWB300 because timing wasn't right. But one of my favorite rifles that I own is a fully left Daystate Harrier SE, an older and more inexpensive version of the Huntsman but quite a nice rifle.
If you get into springers, quite a few are southpaw friendly with ambi or "ambi-enough" stocks, and very accessible safeties at the back of the receiver.
And if you get into the "so much money it hurts" category, you can order a fully left hand American Arms, WAR, or RAW rifle. If i ever come up with a pile of money and my wife isn't looking, I believe a lefty raw would find its way to me.