I recommend buying from local hobby shops and supporting them,that is where I buy all I can,unless there is someting they cannot order east(like my Hacker/Schultze I had to order online).
Kokam makes great quality LiPo cells.
Second NO you cannot use a standard charger made for NiCd or NiMH cells.Uless you have a higher end universal charger made to charge standard and LiPo cells.
Even then caution should be used,I would only buy a charger made for LiPo cells.
Using the wrong charger = major hazard and can reslut in the LiPo inflating and blowing in a BIG ball of flame.
Astro makes some fine LiPo chargers,can be found around $125.But you can buy much cheaper,simpler LiPo chargers(Celectra) for around $50 that work well.
I would not go with the cheapies and not overspend either.Like with any charging,basic precautions should be applied.And cells should be monitored for abnormal heat and cell deformation.