Why would you want to, they take all of your profit.

I would not waste any time finding any of them, most charge thieving high fees.

Last one i did was a listing and the relo comany was SIRVA. I didn't do anything special, the sellers can hire whatever agent they want, although I'm sure SIRVA has agents for sellers that don't already have one.

I belong to the Worldwide a Employee Relocation Council (ERC), and have been working with mobility clients for almost 10 years.  It depends what you call "relocation." The companies that I work with typically serve as the full-service mobility, relocation, benefits administration, and tax consultants for domestic and international moves of corporate personnel.  These firms commonly have relationships with an approved "network" of relocation certified brokers and relocation directors, many of whom hold the CRP or GMS designation.  There are also a myriad of smaller DSP (destination service provider) firms out there who solicit bids from local agents when they get an assignment in a local area.  These companies have much less stringent requirements for qualifying the agent who services the transferee.  These companies will hire an agent, as opposed to the brokerage.  Find them as you would any new client opportunity - do a google search.

Most relocation companies work with national real estate companies . In recent years relocation have been affected by the economy and many companies cut back on relocation packages 

Relocation companies want to work with experienced agents that have a success track record of being able to work this high demand business. Many companies offer training and have a select group of agents that know how to work it. The broker gives the relocation companies the assurance that the business will not be lost.

You have to work through your company to accept listing appointments.  From there you can build your RELO business.

Once, I attempted to connect with relocation company, did not work well.

My brokerage has a contractual relationship with a national relocation service.

I don't. I haven't heard any buzz that it's worth it.