Rear bar costs a little over $200 supply only. Easily fitted yourself, no wheel alignment necessary (well not really unnecessary, as your car will now handle differently so you probably would want to put in new settings to suit, what I probably mean is changing the rear bar won't affect your current alignment setting like changing struts/springs would).

For a classic shape, 24mm adjustable seems the most popular size for a rear bar. Do a search on this topic, should churn up a fair bit of info.