What to do with a spare of $150? Nothing. Just keep them right there in your pocket for the next two or three months, while you get familiar with what SEO is all about. Only then you will have your answer on what to spend them on.
Contrary to what others advised you above, I would not recommend you to buy any of the services available on BHW
unless you clearly understand the effects of that particular package.
Familiarizing yourself with the tactics related to SEO will prevent both you and the provider from a lot of headaches. It is very likely that you're going to buy something, your website will tank and eventually you'll give the provider a negative feedback because it did not not do what you thought it was supposed to do.
You've entered an area that requires a lot of trial and error, so it would be wise to keep your losses at the lowest level as possible. I'm saying this because you will spend some money on stuff that won't help you much.
There's no such thing as an 'Authority website' in a box. It's a term which unfortunately a lot of people misunderstood and helped to propagate it rather incorrectly. It takes years of effort and hard work to build one so you will never find them selling for $199 at your local virtual Walmart.
P.S. You're obviously new to this so I suggest you to always spend some time judging before taking an action, as you will hear people saying that pigs fly now. They never did and never will.
