However, I notice that the CD drive does not use standard SATA connectors. Is there anywhere from Lenovo I can purchase something that will act as a converter/bay to put a 2.5" hard drive in the place of the CD drive?
Yes, you have many choices.
I own the Lenovo version, but I feel it is overpriced.
Check out this thread:
Ultrabay drive caddy
or just Google Ultrabay Caddy