Do it right or don't do it. There are groups like the Lions Club, Rotary, Kiwanis Club, etc. These groups are primarily community involvement groups. A lot of business opportunities exist, and networking does take place within these clubs, however, it is not their main focus. Do not get involved if you're not looking to give time to help out in your community.
Most chambers are extremely active in business networking.
Your local chamber can also be a good source of local business information and assistance. Chambers do not have restrictions on who can join, and any number of the same types of business can belong. Generally speaking, if you pay the dues you're in. Remember though, there is more to being in a Chamber of Commerce than simply putting the plaque on your wall. In the Networking category, almost without exemption, only one business of each type is allowed to participate in each chapter.