LEO vs. L1

I have a very difficult time understanding how one computes orbits,
trajectories, launch windows, delta-v, etc. Can any of you answer
these two questions:

Is there a signficant difference in launch costs between launching
from the Earth to LEO and launching from the Earth to L1? (I found
the answer to this question: One Way - Delta-v = 3.77 km/s (1.87
propellant mass surchage); Round Trip - Delta-v = 3.77 km/s (up)
+ .77 km/s (down) = 4.54 km/s total (2.69 total mass surchage)
(Source: "Strategic Considerations for Cislunar Space
Infrastructure", by Wendell W. Mendell (available online - just
google if you're interested in reading yourself)

Do you know where there are currently any launch vehicles capable of
transporting payloads to L1?

Jack