Rosewill RHAH-13001 1500W Quick Heat Ceramic Heater for $14.99 after coupon code EMCWHHD78.  Shipping is $0.99 for a total of $15.94 shipped.  Here is a screenshot for your reference.  It features 1500w heating power and an adjustable thermostat.  It's a pretty simple and straightforward compact ceramic heater.  Most places have it for about $24.