Disclaimer
This information is just a walkthrough on how you can buy anything you want in Nigeria without money. Here, I will be sharing my personal experience and methods I used to buy the item I attached in this post and some other items I've bought.
However, I'm not guaranteeing you that this method must work for you as its result depends on some factors such as:

The availability of sellers and their willingness to contact you

Your budget

Your honesty level

With that being said, let's start.

First step
Visit and create account with hiyes.ng
All you need to have an account are

Your email address

First and Last names

Then you enter a password

Now you can start buying anything without money.
But how?

Step 2

Click on the "+" button at the lower left of the screen if you are using a mobile device or start posting what you want if you are using a PC.

Announce what you want to buy in details. e.g "I need a Samsung S6 tablet"

Add a clear picture of the item you want to buy or something similar

Add the budget you have for this item and click the "Post" button.

After you have posted your announcements, you will see that your earning below it will be "N0.00".
This is because no seller has contacted you yet for sales.
Give your posting a short while, probably some hours, you will see your earnings growing. This is because hiyes.ng charges sellers 1% of your budget (the budget you want to buy this item) and pays you with it.
This is to say, if your budget for Samsung s6 is N250,000, hiyes will charge each seller that contacts you just N2,500 with which you get paid.

How To Receive Payment
Receiving payment on hiyes.ng is very easy as they pay you in any Nigerian Bank or e-banks such as Opay,Palmpay etc.
However, you can only be paid after the transaction has been closed.

Closing A Transaction
Hiyes.ng ensures transparency exist in the transactions made on their platform as such you get your payment same time the seller whose product you bought gets his/her payment. This is made possible through their Escrow service. Here, you decide to buy from a particular seller from the list of biddings/pitches you got under your announcement by clicking on the "Buy" button. Hiyes.ng will then notify the seller that you have just paid for his/her item, he will be directed to ship the item to you within a 7-day interval. Mind you, the payment you made can't be withdrawn by the seller until you receive your order. After you have gotten your order, you will proceed to your hiyes.ng dashboard and click on the "Authorize Payment" button, this will enable the seller to be able to withdraw the payment you made and you can now be able to withdraw the earnings made from this announcement.
In the post I attached above, I had up to 84 sellers contact me and that made me #75600 after I closed the transaction.

Conclusion
I will advise anyone that buys things online to use this method as it guarantees you high earnings and security.