Trying to sell your business’s products online? Search Engine Watch profiled the 10 best shopping engines that will allow your business to expand its reach and get your products to consumers.

Here are their picks in best comparison shopping engines, based on traffic, revenue, conversion rate, return on spend, average cost-per-click (CPC), quality of merchant tools, and merchant response ratings.

1. Google Product Search Google Product Search, which is transitioning to become Google Shopping, is a free CSE which generates the most traffic and conversions. Merchants can manually upload feeds or use an FTP to upload in bulk. Google is consistently the best performing CSE.

2. Nextag (CPC) Comparison shopping site lets shoppers search products, event tickets, real estate, book travel plans, find sales and more. Nextag’s CPC pricing model allows merchants to optimize where their products appear on comparison pages. Supports bulk uploads. Nextag is the best performing paid comparison shopping engine.

3. Pricegrabber (CPC) Paid deal site features coupons and weekly specials. Shoppers can compare product price, reviews and merchant ratings before making a purchase. Users can search in English or Spanish, with product searches tailored for retailers in Brazil and Mexico. Merchants using Pricegrabber also have the added advantage of sending their product listings to Yahoo Shopping. Allows bulk data feed upload through an FTP.

4. Shopping.com (CPC) Paid comparison shopping engine aggregates product listings based on price and merchant attributes. EBay owned Shopping helps consumers make quick, informed purchasing decisions with its product reviews and ratings. Allows bulk uploads via an FTP.

5. Amazon Product Ads (CPC) Unlike the Amazon Marketplace, Amazon Product Ads allow merchants to link customers to their website externally. This is a good option for retailers that don’t wish to list on the Amazon Marketplace, or those who are already listing there.

6. Shopzilla (CPC) Price comparison shopping site helps connect shoppers with unique retailers, sales, and customer feedback to help them make important buying decisions. Shopzilla connects shoppers with over 100 million products across its partner sites such as Bizrate. Allows bulk product feed uploads through an FTP.

7. Pronto (CPC) Shopping site which provides shopping results for customers looking for low prices and top performing merchants. Allows whole feed processing through an FTP.

8. Become.com (CPC) A Shopping partner, Become provides research information to help shoppers find the right product, review product details, reviews, articles, and other relevant shopping information. Accepts bulk feed transfer with an FTP. No initial fee.

9. Bing (Free) Free price comparison engine compiles product data, price, and reviews for user searches. You need to establish a Microsoft Advertising adCenter account to use Bing Shopping, but you won’t be charged for any clicks from Bing.

10. TheFind (Free) Shopping search engine displays product information, coupons, and local searches for merchant listings. No feed submission. Instead merchants can give TheFind bot access to their product pages for crawling. Listing and setup are free.