T-Mobile's G1 Android phone has had its first price cut, just a week after going on sale in the US.

The first Google Android phone will become available today in select Wal-Mart stores for $148.88 (£92), with a two-year agreement. That's $31.11, or about 17 percent, less than the T-Mobile pricetag of $179.99 (£112). The offer will be available to all new T-Mobile customers and to any existing customers who qualify for upgrades.

"They will launch in top markets where consumer interest is expected to be very high and where the T-Mobile 3G coverage area is available," said Wal-Mart spokesperson Melissa O'Brien.

T-Mobile G1 review

Google Android review

Most major metropolitan areas will be included, O'Brien said, though specific locations aren't yet being revealed - so you may want to make some calls before you make the drive. More stores are expected to be added as the phone becomes more readily available.

The T-Mobile G1's manufacturer, HTC, is now projecting sales of 600,000 devices by the end of the year, according to a published interview with its chief executive last week.

"It will be more than what we originally planned," CEO Peter Chou told The Mercury News. "I'm saying we will ship more than 600,000."

Early estimates had placed G1 pre-order sales alone at 1.5 million, though those figures were later called into question. As for future sales, Chou declined to provide any specific numbers but said he expects to "do more next year."

"We are confident about our competitiveness," he stated.

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