it would be cool to have a feature similar to the steam martets "request to buy" system, so if you want to buy an item for a certain price or cheaper, you can create a purchase request for that item and as soon as somebody puts that item for that price on the market it will be automatically sold. the purchase requests could also be visible to everyone so if somebody wants to sell something quick, they can look at the requests and sell it for the requested price.

What if two people request to buy the same item for the same price?

the one who made the request first gets it