When you are searching for cheap vps packages Burist.net is one of the cheapest web hosting providers comes to mind if you take reputed web hosting companies. They have cheap unmanaged vps, windows vps and dedicated server packages which are pretty good comparing with prices.
There are both good and bad reviews about Burist vps. Some say Burist.net vps are good and some say Burist.net vps sux. I don't use them so I have no idea how they are. But this post is about 20% off promo code offered by Burist.net but not about reviewing them.
You can use WINTER20 Discount code for buying their vps with 20% life time. I think for new users and those who willing to do a new order only not for old customers. But you might need to contact them and ask about it.
Brust.net cheapest un-managed vps packages start from 6.95 USD per month. That's 1000 Mhz machines with 20GB space and 512MB Ram. That's without the discount code. You can find more info from their website.