I just got some off of ebay from China. They appear to be good quality, but they don't always seal up perfectly and the shipping times are long. I'm just using them to pump hot water so it's no big deal to me. I then found them just as cheap with quicker shipping from a company in Texas. I'm not sure I should post their name on here since I'm a noobie and don't know all the rules. If you want to know more I can PM you.
I was going to say Bargain Fittings. They have excellent prices, fast shipping, and great customer service. They usually have things here to me in Virginia in two days.