Help with questions for commuting to work

I live in Boston and have to use a ride for my student apprenticeship, I do not own a car and public transit does not get me to clients homes that differ daily and or weekly with my student apprenticeship :( 

Hoping maybe someone may have some insight for me. Which is cheaper, Lyft Pink, Uber, or a Cab for morning ride to apprenticeship ?, or are there other rides that are less expensive to use ? And is it cheaper to schedule the ride the night before ? Is it also cheaper to ride before or by 7am ( not sure what rush hour times are during work days M-F but think it is 7am-9am, so if I got a ride before 7am, might that be cheaper ? I have been using Lyft Pink this past month 3 weeks when I received my apprenticeship, but it has been so expensive, even with the shared rides. I have to do the student apprenticeship hours to become licensed, the Lyft Pink rides are costing me what I get as a student apprentice...If Any insights, it would be so helpful, I tried Boston Craig's List for someone who drives on there own for maybe lesser cost if they are guarrenteed the 2x a day ride and was blocked by Lyft, placing an ask for someone that may be interested, I was shocked Lyft did that so weird. I am a student apprentice and do not have alot of money, just trying to find a way to do my student apprenticeship somewhat affordable. Hope I don't cause another problem for myself for posting this, I am just trying to get some ideas, help etc.

Thank you very much in advance !