Question: Do you know of a service that aggregates listings from various resale platforms to help me find the lowest price for a used item?

If you want a service that collects listings from multiple resale sites so you can compare prices and find the cheapest option for a used product, Beni is a good choice. Beni is an AI-powered shopping assistant that lets you buy used products from more than 40 resale sites at a discount, all in the name of sustainable commerce. The service is available as a browser extension and mobile app so you can check prices and look for alternatives to new products while you're shopping. Features include aggregation of resale deals, mobile and desktop apps, favorites and alerts. Beni is free to use, though it makes money through affiliate marketing, and it covers more than 2,000 retail sites including Gucci and Target.

Another option is Penny AI, which offers three ways to help you make a more informed purchase. Penny AI can compare prices across many sources with a single click, find related products based on your search query, and provide pros and cons analysis generated by AI. The idea is to make shopping more efficient so you can spend less time and money, especially when looking for alternatives and weighing the ups and downs of products. By using AI, Penny AI can bring a data perspective to your purchasing decisions.

If you want something more direct, try Score, a browser extension that performs an instant reverse image search to find matching or similar products. Score searches a curated list of retailers like Google and Bing, and it includes shipping costs in its price calculation for a more realistic price tag. It also doesn't sell your data to advertisers, so it doesn't compromise your privacy. The free version has some limits on reverse image searches, but the Score Pro version offers unlimited searches and other features for a monthly subscription. It's good for finding the best deals in the fashion and furniture categories.