Most Eagle, Lowrance and Humminbird locater models are available in a portable version which means they come with a case, battery pack and suction cup transducer. Bear in mind that these portable units are designed to be used in fishing boats. That means there is little consideration given to packed size and weight and the transducer will be designed for the transom of a boat - not exactly the ideal orientation for canoe use. Generally, these portable versions sell for about double the price of the fixed mount units.
An alternative is to adapt a fixed mount locater for specific use with a canoe. If you search around this site a bit all the info is here or send me a PM and I'll help you out.