Gwen Stefani's concert is getting off to a rocky start ... tickets are being hawked for half price even before the tour begins.
Gwen kicks off her concert series in Massachusetts July 12th. Ticketmaster was selling seats for $80 a pop, but now there's a special -- July 1 - 4 you can buy them for $40 each.
We're guessing Gavin's not incentivized by the price slash.
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