I didn't know about Rocket Fish being a Best Buy store brand.. but I do know that Dynex power supplies are a Best Buy brand. I have a 500W and it appears identical to Antec, so possibly made by Antec?
No, until recently, both Rocketfish and Dynex--Best Buy house brands, were made by Huntkey, a less than quality manufacturer.
Recently, BB's source of Rocketfish/Dynex power supplies moved to CWT as an OEM maker, and while they do perform better, they're still well below the quality of Corsair, Thermaltake Toughpowers, Antec TruePower, Antec Earthwatts, or most any other reputable brand of power supplies.