Well, the NSW BDM is putting the V numbers back into the Early Church Records Indexes, (JM sighs )
In 1851 John I HALBROW’s baptism is registered twice. Volume 141, line 882 and Volume 68, line 1348 with parents as Isaac and Johannah. Volume 68 is definitely for 1851 and for Roman Catholic Baptisms. Vol 141 is for supplementary registrations.
In 1854, Vol 71, line 1059, Peter J HOLBOROUGH, parents as Isaac and Johannah, Vol 71 is Roman Catholic Baptisms.
Answering OP's question ..... No, not cheap, just making sure your penny wise, to become pound wiser for further family history certs

ADD, any ECR in volumes HIGHER than 123 you must get from NSW BDM as they have these. Vol 1 - 123 are imaged and originals no longer accessible to general public and archived at State Records. (That may have changed in the past decade, but that's the way it was back pre about 2000)
Cheers, JM