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Hey Wubbles,
I realise that my response is a bit late, but there is some peer-reviewed literature on this matter. The most relevant paper would be this one from 2005. The main results are:
Unfortunately, I am not aware of any more recent paper using updated azythromycin costs. It would be interesting for someone to perform a new cost-effectiveness study based on the 2015 International Medical Products Price Guide, as the price of azythromycin is known to have decreased since 2005. There is, however, a recent study restricted to Malawi that suggests that mass treatment with azythromycin may be cost-effective.