Live Nation head of global touring, Arthur Fogel, has said that Madonna’s upcoming US concert tour is on track to be one of the top-grossing outings on record.

So far, 653,000 tickets to the 43 North American dates have sold and about 30,000 tickets remain available for the tour’s 36 US shows.

Fogel said most of those are either single tickets or seats that are set aside for disabled concertgoers: “We are inches from sellout everywhere.”

Tickets for US dates went on sale in mid-February and range in price from around $45 to more than $350. Some premium-priced ticket packages run at $600 per person.

Fogel also said that the 30% of ticket buyers who had signed up for a free copy of the singer’s most recent album, MDNA – a deal only available in the US - was a high acceptance rate for such offers.

According to Nielsen SoundScan the free-album offer fueled a healthy first week for MDNA, which reported 359,000 copies sold in the US, Live Nation said that between 200,000 and 250,000 of those sales represented albums given away with concert tickets.

In subsequent weeks, the album’s sales have slowed, and it has now sold a total 456,000 copies in six weeks.