Currently the price of 250' of #14 stranded wire is $47, and the solid roll is $43. It can be bought by the foot at $0.35 at Home Depot.
As said, PVC is available for insulators for less than $2 for a 10' stick.
If you can get beyond a small bit of SWR, and not need to put a lot of watts on the wire, even 75 Ohm RG6 coax can be purchased cheaply from Home Depot and similar stores. A 30' to 40' extending mast can be made from electrical conduit at about $50, a fraction of the cost from online sources. Although it isn't dacron, poly/nylon rope for guying can be sourced from THD and similar stores.
For more or less than $100 an entire antenna system can be acquired from your local home improvement retailer.
Start with those parts of the setup you can and work it out as you go.