My 14 yr old Shih-Tzu has Canine Cognitive Dysfunction. Vet prescribed Anapril but it is 80. monthly & I lost?

my job. I am desperate because I love her dearly and want to help her senility. She is very disoriented/unfriendly/doesn't want to be petted/stairs at walls/urinates in the middle of sidewalks/barks all night. Help me? Is there anyone who sells Anapril cheaper?