I was there with a friend recently, and found the owner to be very helpful. He helped put together a package of most needed equipment, and even threw in some extras (like nutes).

It's likely that any shop owner will act bad towards you, if you let on what the equipment is for. They need to protect their business, and if you let on that what you're doing is illegal, it could get them into trouble.

I've looked around to see if there was another shop anywhere in the area, and it seems that MD Hydro is the only decent one, that can be found through the Internet or online phone directories. I did find another hydro supply shop, but it was in Woodbridge, and believe me - you do NOT want to go there. It was some guy's house, and it in no way resembled any kind of business.