Sorry, can't lead you to a specific website. But here's some suggested pumps if you're looking for reliable and low power consumption. It's important to get a decent one, particularly if you plan on using it to keep a hole open in the pond during winter. I will basically just shut everything down and keep the BD air diffusers going all winter to do so. Essentially, this pump will run 24/7/365, so it's worth spending a tad more if you can swing it.
Here's some suggestions to consider and start to research:
Pondmaster AP-40 will be on the cheapest end, but reliable. You can easily replace the diaphram easily. Con: a tad noisy if you have it to close to the pond. If you can put it at least 10 feet away and cover it with an irrigation box, it will be fine. I have this one on my current pond and I have had no problem with it. I will be selling this pump once my build is over. It only has one year of use on it.
Alita AL-48. Very reliable only one moving part. I believe DoDad carries these and can give you a better price than what you see online. a bit expensive.
Hakko 40. Similar to Alita. Very good brand. a bit expensive.
Medo LA45. Very good brand. No moving parts. Extremely quiet. I have the LA-80 on my new pond. I ended up buying it cheaper on Ebay through a sump pump company (versus a pond company). I can give you the lead on that should you want it. This brand will likely be the priciest option.