Victory Force do a 1/48 D model slick, the most used transport version, complete with crew. Will set you back around $90AUD a pop.
Easy Model make a 1/48 UH-1C, which if you are a purist, is a largely pointless exercise as C model Hueys were dedicated gunship models and the Easy Model version (essentially a pre-made, pre-painted version of the Hobby Boss Huey) comes without any weaponry. If you aren’t fussed by accuracy and just want a proxy, these are much, much cheaper. Be aware that they also produce 1/72 versions so check if ordering on-line.
Corgi did a 1/48 UH-1C/ E gunship. You can find them on ebay, usually for silly prices.
Beyond that, it’s all plastic kits, to the best of my knowledge, with the aforementioned Hobby Boss kit being cheapest but least useful unless you are prepared to do substantial conversion work.