The DVD, Live at Montreux, which includes material from Rory's five solo shows at the famous Swiss jazz festival, currently tops the Irish DVD sales chart.
The double disc set is also faring well abroad: it's at number 5 in the UK chart, number 6 in the Netherlands and number 15 in France.
And the timing of the release couldn't be better - June 14 marks the 11th anniversary of the death of Gallagher, and there are a series of events planned to mark the occasion.
A bronze sculpture of Rory's Fender Stratocaster guitar will be unveiled by Lord Mayor Catherine Byrne at Rory Gallagher Corner, in Dublin's Temple Bar. A free concert will follow at Meeting House Square.
Cork, the city where Rory was brought up, is also paying tribute to him. An Cruiscin Lan It hosts three different shows this weekend (June 9-11), with bands from the UK, Germany and Italy playing alongside local acts. Tickets are €15 for each night, or €40 for all three.