Keep it cheap
A couple of ideas: One of my favorite techniques when I need something is to place an ad in the local paper stating what I am seeking. Amazing how many people will call with the item I seek, people who would never place an ad for sale-not wanting to deal with telephone calls and the hassle. I recently got a top of the line, 2 year old hot tub for less than half price! Also, hit the back lots of local boatyards and dealers, looking for a stray. Many small sailers are abandoned when the rent is not paid. Also, You might be able to buy a whole boat for less than the cost of a replacement mast, take what you need, sell the rest. I've seen boats taken to the refuse transfer station because the owner wanted the trailer, not the boat. Good Luck. Keep the slimy side down.