I have a Hampton Bay Contractor Edition 52" fan. I would like to get a lighting kit for it.
The model number of the fan is: E227934 in White. Is there any website that I could order this kit from, if it exists?

Let me Google that for you (http://lmgtfy.com/?q=hampton+bay+fans)

I found out that Hampton Bay is the brand name for Hunter fans in Canada, through Home Depot.
The only model of light kit available for the Contractor Edition is # 28098, a 4-spot light kit w/ included CFLs.
I had to place a special order and I will be called when it arrives. Cost – $70 CDN + tax.