Purchasing chain and sprockets,best deal???

The time has come to replace the chain on my bike,and although the spockets look fine ,I understand it is common practice to replace them as well.I have got a few prices from here and there,but Im a bit confused as there has been price differences of up to nearly $300.00 ,which seems very extreme.I'm either getting ripped off with one or an extremely good deal with the other.I totally understand you get what you pay for,but dont want to pay anymore than I have too ,but still know that I'm purchasing a quality product.If anyone knows of a supplier that would do a good deal,I'd be very appreciative.

Ebay USA is a good option at the moment with the high $A. I recently bought this 520 conversion kit, postage was $55 and and additional rear sprocket was $55

http://cgi.ebay.com/ebaymotors/ws/eBayI ... MEWNX%3AIT

I got an AFAM sprocket and EK chain kit from someone on here, lifetime sprocket warranty as long as you use their chains. Standard gearing only.

We do Driven 520 Chain and sprocket kits for $299 and we can always offer a better deal for members, pm me if your interested