Business oral: sentences that may be used during price negotiation

In general, there is no bargain for shopping in American stores. However, it is possible in many cases. For example, American garage sale, street trade or flea trading. Especially when you buy big things, such as a house or a car, you must pay the price with the other party. Otherwise, you will lose money.
The following lists the sentences that may be used during price negotiation:

How much is this?

How much will that be?

How much are these altogether?

I think this is too expensive.

That's little too much for me. Could you make it less for me?

I can't afford it. This is too much.

This is not a reasonable price.

I don't have this much cash on me. Will you make it little cheap?

What's the regular price? Do I get discount on this?

Tell me what's the best price you can do for me?

If I pay you cash, will you give me some discount?

I 'd buy this if you can make it a little less expensive.

I 'd buy it if you reduce the price a little.

May I have a discount on this?

Will you give me a discount?

Can I have a discount?

Wocould you give me a discount if I buy three of these?

I 've come all the way from China; please give me a better price.