Whenever possible, I try to do a package price. This works when all the pieces are things I can do, or I can accurately predict my outsourcing cost. It doesn't

Whenever possible, I try to do a package price. This works when all the pieces are things I can do, or I can accurately predict my outsourcing cost. It doesn't work when a project gets thorny (damn you google APIs!) For ala carte or ongoing work, I sell prepaid blocks of hours. I offer 10, 20 and 35 hour blocks; 10 hour blocks are at my highest rate, but if the client buys more then the hourly price goes down. If they don't use up all the hours, then they can bank them for later.