The group are looking set to bring Ed Sheeran’s eight week run at Number 1 to an end come Sunday's official chart.
The five piece – made up of Michael Auger, Richard Hadfield, Jamie Lambert, Matt Pagan and Thomas Redgrave – won BGT earlier in the summer, getting themselves a spot on this year's Royal Variety Performance and a cool £250,000 prize.
And they were subsequently snapped up by Simon Cowell’s record label, Syco.
Collabro released their debut record Stars this week and according to the Official Charts Company’s sales data, the album is currently outselling its closest rivals by more than two copies to one.
But the group aren't the first act from this year's series to set the chart alight.
BGT runners up Bars and Melody went into the Top 5 just last month with their debut single, Hopeful.
Elsewhere in today's midweek chart and former X Factor act Union J look set to claim their highest charting single to date with new song Tonight (We Live Forever).
The track is currently sitting in the Top 5, one spot better than their previous chart best of Number 6 with their 2013 debut single, Carry You.