I Have Been Taking Novolin 70/30 And Lantus For Several

I have been taking Novolin 70/30 and Lantus for several years. the cost is high to me because I take a lot of other medicines and some of them are high to. I am on SS and have Humana ins as well as SS. I am 62 years old and me and my doses but hard to find one that works goo and my doctor does not want to change med. can you tell me any med. for type 2 that would work better and at a low cost?