Good shoulder holster?

[ldp4570]

Im new to the conceal carry world, and I'm fairly certain that I will get the MTAC holster, but I also want a shoulder holster. I googled it and have seen some for around $30. I just cannot imagine that a $30 holster can be that comfortable or of a good quality. Any suggestions on a good shoulder holster? I'm wanting something in about the $100 range.

Thanks!

Is this for your primary carry, or BUG?? What type of gun??