Alpha 7 on back ordered

We started to give our calves alpha 7 last year and seemed to work really well, but now I went to order it for this years calves and it is back ordered thru valley vet.  My vet doesn't carry it they are stuck on using vision products.  What are other people using to replace Alpha 7?  My vet says that it is a waste of time giving that shot, but it seemed to work, so I want to give them something similar but not sure what to use.

Thanks

Try Cobalt 7 or 8 from Agrilabs. Less expensive and I think it is manufactured by BI.
http://agrilabs.com/documents/CBIO-0088%20-%20Cobalt%20Detailer%20(Rev%200912)LR.pdf

Correction: Manufactured by Zoetis (Pfizer) for Agrilabs.