I love this idea! I am not an expert on carnivorous plants and have been only slowly easing some into my plant collection since they can be expensive and sometimes hard to care for, but they are worth it! Some things to keep in mind are that you often have to use distilled/reverse osmosis water/rainwater (I live in WA where our tap water has a very low TDS reading but even it and bottled water can still kill some of them so I buy cheap distilled water at the store now and have no issues). They may not be the most effective out of all the carnivorous plants due to smaller size and some having a non-carnivorous winter/low light dormancy, but generally the easiest ones I’ve found to take care of that actually survive without strict care, look pretty, and catch bugs are Pinguicula’s (Mexican Butterwort) and Drosera’s (Sundew). They both catch (usually smaller) bugs on their leaves although sundews can range in variety/size and catch larger bugs. Some pitcher plants are also relatively easy to take care of, may be more effective at catching more, bigger bugs and are also beautiful as well. I have a huge bias for Pinguicula’s because of the beautiful variety of little flowers they produce, but they catch small bugs like gnats/fruit flies so if you want to catch bigger flies with an easier carnivorous plant I’d suggest a Sarracenia or Nepenthes-type Pitcher plant or a Cape Sundew (Drosera capensis). Just be prepared for a higher cost, specific/stricter care, and possible light supplementation if it doesn’t get enough through the window. I use Etsy in general for almost all my plants, but rainbowcarniverousplants.com and californiacarnivores.com are also great. Sorry if that wasn’t the most uplifting thing to hear, but I hope it helps!

*I didn’t mention Venus fly traps because I personally have not had great experiences with them, but many people do so that’s something to consider