That's a very open ended question and we'll need more information!
What sort of products and how many?
What specific cart features? ie ability to show products in various ways
Do you need promotion methods, upsells, discounts, customer accounts?
What payment methods/gateways?
What budget do you have for software?
Who will provide support?
Depending on the clients abilities the admin side of things is very important, and finding one they can understand and use is a major factor - a lot of carts a very complex for the average Joe!
As for price chrage your normal rates 
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