I picked up a box of Tide Coldwater powder a couple months ago. Wal-Mart only carried a larger size ($12.99?), but I found a smaller box at the local grocery. I don't know if Wal-Mart still carries the powder, and I haven't looked again at the grocery. It does work well, but I still use a warm EcoActive wash (with the usual F&P cold deep wash). Since it's (presumably) quite strong, I've used it only on whites/towels, not on jeans or casuals. The box is almost used-up and I haven't gotten more as I have plenty choices of other detergents (Foca, Roma, Ariel, Ace, and Fresh Start courtesy of Bryan/WestTexMan).
Granny had a box of Tide/Downy some months ago, but it's not possible to get a detailed opinion from her on it. I asked how she liked that soap, she said "OK."