Blockbuster Inc, the No. 1 U.S. movie rental chain, said on Monday it has offered to buy electronics retailer Circuit City Stores Inc in an all-cash offer in the range of $6 per share to $8 per share.

Blockbuster said it made the offer in a February 17 letter to Circuit City's Chief Executive Philip Schoonover on behalf of Blockbuster's board, but that Circuit City had so far failed to provide due diligence.