The old Winchester Model 95 was a lever chambered for the 303 British. Of course you are going to pay dearly for one. Savage Model 99s were chambered for the 300 Savage, which, ballistically at least, is a step up from the 30-30. Then you have all your levers in 308 Winchester: Savage 99s, Wincheser 88s, and my favorite, Browning BLR. And the BLRs are now available in a long action 30-06. There are probably others also.
Wally