Research in Motion has given retail partners the green light to slash BlackBerry PlayBook prices yet again. Staples and Office Depot have already jumped at the opportunity with others likely to follow soon, as first reported by BGR.

RIM indicated during a recent earnings call that they would begin price promotions over the second half to get devices in customer's hands and it appears those plans are well under way.

As of writing, Staples and Office Depot are offering a $100 instant rebate on all three PlayBook models as well as a $100 mail-in rebate. The after rebate price for each model is as follows: 16GB for $299, 32GB for $399 and 64GB for $499.

BGR was also told that Walmart is offering an unadvertised $250 sale on the 16GB PlayBook, although officials at Walmart did not respond to a request for comment.

RIM had high hopes for the PlayBook with estimates to ship 1 million units back in January. During a conference call earlier this month, RIM announced that the company had shipped only 200,000 PlayBooks during the past quarter, a drop from 500,000 tablets that were moved in the first quarter. Based on reports from the Guardian, it is believed that RIM has nearly 800,000 excess PlayBooks still in inventory.

It's still too early to tell if this is the best buy-in point for the PlayBook or if potential suitors should wait it out. Rodgers company employees are now able to purchase the tab at up to 50 percent off, with the 16GB model availabe for only $249.