DeepDiscountDVD.com Though they list part 1 as widescreen, it's not actually. That's where I bought my copy, and it's just the same release as everyone else had for a little less money.
I've seen season 1 part 1 and season 1 part 2 at Suncoast. But the prices were absolutely exorbitant. Hell, I think the prices @ DeepDiscountDVD for that are exorbitant too.
I got the whole series off ebay, it was a chinese version(has subtitles in Chinese) and is good quality for about $40 plus 20 in shipping. The problem I had with it though was that it did not play on older DVD players. Still it was the whole series and helped me catch up on TF universe