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I have two both a crockpot brand and Hamilton Beach 4 quart slow cooker got both (at separate times) for under 20 dollars both have a simple knob, not digital and both have made great meals and are still going strong.
America's Test Kitchen did a test on a bunch of slow cookers, most that they recommend are out of your price range but their "Best Buy" is the Small Category is the Hamilton Beach Stay or Go 4-quart Slow Cooker it got a 3/3 in cooking and 2/3 in design it is manual and should cost around 35 dollars.
The favorite for the Large Category is the Crock Pot Touchscreen 6.5 Quart Slow Cooker costs around $130