It’s the first time the sometimes wayward superstar has played in the Midlands since 2004.

“It’s probably about half-full. There’s good availability,” the venue’s box office told the Leicester Mercury a week before show date.

Special offers such as £30 ($48) tickets, almost half the £55 ($88.20) top price, and two extra tickets for anyone who buys 10 have helped stimulate sales.

The cut-price £30 per ticket deal was brokered by tour promoter Live Nation with discount site Groupon, which sold the 238 tickets on offer in a matter of minutes.

“Offering a discounted deal on Groupon is not a reflection of the quality or status or sales of a show but rather segmented marketing and a way to reach new and additional consumers,” an LN spokesman told the Mercury.

Spears’ “Femme Fatale” spectacular has won rave reviews and Rolling Stone described it as her “flashiest, fastest moving, and most entertaining production yet.”

At post time it wasn’t possible to gauge if the Birmingham sales were an indication that Britney’s UK tour isn’t doing well.

A spokesman for Manchester Evening News Arena said its Nov. 6 show was close to selling out its 16,000 capacity, but several websites were offering discounted tickets for her London shows.