Reported speech?

Hi,

Let us pretend that I have a nice used pen for sale and I want to sell it to the highest bidder in a garage sale.

1. My friend: Hi, John said  that he will buy it for *** dollars. Would you go for it?

In reported speech, the above construction wouldn't work and the sentence below, which seems the correct reported-speech version, doesn't seem much different in tems of  the overall effect.

 Hi, John said that he would buy it for *** dollars.

2. If I put a date at the end ofthe sentence, how can I report it?
 My friend: Hi, John said  that he will buy it for *** dollars on July 7th. Would you go for it?
Reported speech??
Hi, John said that he would buy it for *** dollars on July 7th. Right??

I think it comes down to what you intended to say/convey, mixing tenses, and understanding the difference between 'will' and 'would.' If you go strictly off of your premise that there's a person seeking to buy a pen from you and you'll have the final say, then you must use 'would'--'will' means it is a definite that's set to occur in the future (whereas 'would' is conditional).