Here is a list of liveaboards with low single surcharge. Upgrade to a room for 2 divers at a fraction of the cost. Pair with another guest or instructor at an adult-only dive resort. Solo travel is fun, but always dive with a buddy.
"Traveling solo may be a choice or a necessity, but it should never be a reason to miss out on the magic of a diving vacation. Unleash your wanderlust spirit by embarking on a solo diving adventure and embrace the full potential of your travel experience. Don't let the fear of traveling alone stop you from discovering the beauty of the Ocean and connecting with like-minded human beings. Create lifetime memories while taking a break from your daily routine and indulge in self-care. My advice is - Take the leap of adventure and let your spirit soar!"