Jericho13 It is advised to purchase a 3D printer since you may need it for other projects, but you can do what I did and print the needed parts at a printing service. The total price varies depending on your preferences. This toy works on servos, so the more you pay for those, the more durable and quiet they will be.
The OSR2+ is similar to other toys out there but more advanced, while the SR6 is incomparable to any other toy. One thing I like about this whole thing is the DIY part. If you don't want to go through the procedure of printing and searching online for the necessary pieces, you can buy a DIY kit and assemble it yourself. If you prefer, some people sell preassembled builds online which you can plug and play directly. But I highly recommend going the DIY route because, in case of a future malfunction, you will know what to do.