I cosplay Sailor Saturn, and for my glaive, I went to Lowes and got a long dowel, a couple fancy chair legs that matched the fluted bits at the bottom of the shaft, and a sheet of wood to cut the blade out of. And spraypaint in my chosen colors: A silver for the blade, and a metallic dark gray for the haft.
I drew the blade's shape on the sheet of wood, and cut it out with a dremel tool (a simple one can be bought for about $20-30, and is a prop-maker's best friend). I coated it in spray adhesive and glued two pieces of posterboard I'd cut to the same shape on either side. This was to give it a smooth finish, with no woodgrain showing through. Spraypainted it silver.
For the haft, I cut off the chunks of chair leg I didn't need with a hacksaw. My two chair leg pieces looked something
like these. Chair legs have screws at the top, so I used those to screw the two parts into each other (secured further with Gorilla Glue), and then attached them similarly to the long dowel. I cut off a few inches of the dowel, too, so my glaive would be proportional to my height. The whole haft was spraypainted in the dark grey (some people do black, purple, or silver for the haft, it's your choice, really).
My method of attaching the blade to the haft turned out to be crap, so experiment with your own method - it'll need to be sturdy, as that will be a very thin and breakable stress point. No matter what you use to attach the two, that joining can easily be hidden with the almost floral-like silver flounce at the seat of the blade - I made mine out of craft foam, painted silver (tip: spray your foam with clear gloss spraypaint first, to keep it from soaking up the silver color and make it more metallic-looking).