Affordable garden border planter

I have posted on here and have been lucky to get some good advice so I hope I may be lucky again!
Our garden has a long back border the length of the house, but it’s planted with conifers so it’s dry and shady underneath. Plants just don’t do well! I’ve got a few that are ok, but I would love to plant just in front of this section instead so I can control the conditions. To make sure we don’t have the problem of dry soil I want to create a raised bed. However, I’m Finding this an EXPENSIVE possible project. I’ve looked at sleeper beds, and 
Wooden raised planters but with slabbing under to give it a level finish it’s pricy once top soil plus the plants are added. Any ideas??


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I think you will really struggle to grow anything under the shadow of those, even in raised beds.
I would then describe a semi circle on your lawn with the furthest tip of the arc going to 1M minimum wide in front middle of the path. Get rid of the grass, improve the soil and plant up as you see fit with a variety of bulbs, perennials, ornamental grasses, shrubs - whatever you like - to give you year round interest and take your eye off the bare trunks and the fence behind.
Plant up with tall grasses at the back that would hide the tree trunks and perennials for colour as obelixx suggests.