There are several ways of going about getting linkedin connections, however if your needs are sort of urgent and you require to buy linkedin connections fast, you will find many sellers online that would be able to offer you personalized services. One of the companies that I have found to be quite good at providing good quality linkedin connections is SMM Panel which you should give a quick try to see for yourself how their service could possibly meet your expectations.
You can find many more service providers through search engines or via forums. However, the best providers of linkedin connections would be those that you will find their previous clients recommending. If you know of people who may be using the services of media service providers, you may be able to seek recommendations from them.
However, if you have no such acquaintances, then you could always resort to the internet as there are several forums and discussion boards that carry information about various service providers. You can expect to get professional as well as friendly advice this way as forum moderators tend to be quite helpful to people who show a genuine interest in a certain topic. You will also find other experts providing you similar advice that you can find absolutely helpful.