RIM said customers can start pre-ordering the gadgets — its answer to Apple’s popular iPad devices — through consumer electronics retailer Best Buy.

The PlayBook has a 17.5-centimeter screen, smaller than the iPad.

It runs BlackBerry software and can connect to a phone, acting as a bigger screen for it. RIM calls it the first “professional-grade tablet.”

The iPad 2, which went on sale earlier this month, also starts at $499.

The $499 PlayBook comes with 16 gigabytes of memory. For $599, you get 32 gigabytes and for $699, 64 gigabytes.

RIM reports fiscal fourth-quarter earnings Thursday.