Amazon has the Intex Challenger K1 Kayak, 1-Person Inflatable Kayak Set with Aluminum Oars and High Output Air Pump for $54.85. One of the lowest prices per CCC. Prime shipping.
You may want to buy a better oar and consider a Ryobi portable air compressor later on. The oars aren't the most solid construction.
Very well rated - portable, durable, and comfortable compared to a typical hard shelled kayak. I own one but was waiting for prices to drop to buy a second one.