Are you looking for a portable trap? You can probably find something on Craigslist using the search term "hog" in either the Sporting Goods or the Farm and Garden sections. Oftentimes, such a search will turn up a local company or welder that builds them at a reasonable cost. If not a portable trap, you can build a permanent corral type trap with T-posts, cattle/hog panel, etc. There's plenty of Youtube videos on how to do that.