I look Market module. Its very good

But i cant find options to put discount  and coupons for products. It will be nice to can use it

I think will be nice to put a field for available quantity. 

I think it will be nice to can sell other type of products too

It will be  good to have COD payment option

It will be nice to have  option to sell in Credits only. In this case owner can have profit from all products. Or to put commission for each product / vendor/ category

I think an affiliates module it will be nice too. Commission can be paid in Credits