Hey There,
That is a tricky with respect to an answer. PCP' s tend to be more the the high end in airguns. It is not just purchasing the air gun but the accessories that support it and work within your wallet.
First off, while I do not own a Brocock (yet!) I do have a high performance costly Air gun, I actually started my journey with break barrels in the 90 - 130 dollar range. My first PCP was a Diana Storm rider with a hand pump. This was low cost and it allowed me to determine if I was going to like air gunning at a pocket affordable cost.
I slowly worked my way up to my first high end air gun as an evolutionary process of out growing my earlier purchases. What you want to consider if you want to jump straight into an air gun like this is your accessories to really take full advantage of you purchase. You really don't want to by a nice air gun only to find you need to purchase higher end supporting components.: (scope, mounts, tripod, air tank or compressor)
My recommendation, study the information on starter PCP air guns. You really don't need to jump into a Lamborghini as your first PCP. There are many starter air guns under or around 300 dollars that work very well. If you honestly enjoy this pastime, you will buy some many more air guns than just the Brocock. At some point you will give each one a purpose in you arsenal.
Enjoy and safe shooting