The L7s from Bitmain can mine both Litecoin and also Dogecoin due to its shared security with Litecoin. These miners are one of the most profitable miners on the market today for all networks and are the most profitable miners for Litecoin and Dogecoin.
There are (3) L7 miners offered from Bitmain, this is mainly due to the chip production runs but all three are profitable.
These miners were available brand new most recently on Bitmain's main website but it appears these are now sold out yet again. These miners can be purchased on the secondary market or can contact Bitmain directly for wholesale options.