The answers is to simply get a proper 4 season tent designed for camping in the winter. There's a reason why 4 season tents are different than 3 season tents, and that reason is because the weather and temperature of that fourth season (winter) is much harsher than the other three. You are not going to find a 3 season tent that performs as well as a 4 season. 4 seasons have a much more durable fly to protect them from the elements, and are devoid of screen vents which let in drafts and let warm air out. Many are constructed with a double wall to help insulate the tent. In general, 4 season tents are significantly warmer than 3 season tents.
You don't have to break the bank buying a 4 season tent, take the MEC TVG for example, It's a professional quality 2 person mountain expedition tent that goes for $339 Canadian dollars, which comes out to only $257 USD at current market prices.
You don't want a one person tent for winter camping if you ask me, in fact not many manufacturers even make 1 person 4 season tents. I've gone winter camping in 1 person pup stents in the past, it wasn't fun, now if possible I always make a snow shelter, which are far warmer and offer superior protection from the elements than any tent.