I won't buy injectors from anyone but Full Force. I had bought my hybrids used, had them in for a few thousand miles, an took a trip to Tennessee for some other stuff, the day I went to leave to start heading home my truck broke down an I wasn't having any luck diagnosing it. I made a call to Matt at Full Force that day, he told me some things to check, an it ended up being a few burnt copper washers on the tip of 2 of the injectors. After I pulled them, I got a ride over to they're shop, they pretty much dropped everything to help me. All I really needed was a new o-ring kit, but since I brought the injectors with me, Cass took them apart on the spit, cleaned an inspected them, then flowed them all right away an set me up with new o-rings an didn't charge me hardly anything. They're customer service is 2nd to none, an they make great products, I always recommend them whenever someone asks me where to buy injectors from.
Swamps, rosewood, unlimited, etc, are all good companies as well, but after the guys at Full Force bent over backwards for me to get me up an running again I won't go anywhere else.