The garlands are the same I've used each year. I just added white garland and snowflakes I bought at Walmart. And I did have to get new lights this year as the old ones died.
Mom gave me her garlands she had used previous years above her kitchen cabinets. I cut the berries off and we hung them in between the pillars separating the living room from the kitchen, forming an archway.
So, all in all I spent very little on decorations. The white garland was $6, I bought 2 packages of snowflakes for $3 each, $14 on lights, and three little birds for $3 each.