There are several places on the Internet, but I would suggest Creepy Hollow Gear creepyhollowgear.com. If you are starting out, I suggest that you purchase a decent digital recorder (I don't know what an EVP machine is, but suspect you are talking recorder?), EMF meter, and a digital camera. There are many that swear by film and others that swear by digital cameras, I think both are fine, but digital gives you immediate results and it is easier to download. Remember, the better the equipment the better the quality of recordings and photographs. I would also suggest that before you use your equipment, practice with it until you can use them in the dark without fumbling around.
I hope this helps, and good luck.
Mark Shadley, Researcher/Investigator Black Hills Paranormal Investigations
Black Hills Paranormal Investigations www.bhparanormal.com "When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes