...and started to look at places that I haven't dove. closer...
Where have you been diving that is closer to home? Cozumel is a fine choice but there are other options, although the recent hurricane damage and the fact that you are traveling solo does reduce the options.
Check with your local dive shops to see if they are offering any trips in March and you may be able to join a group at a reasonable price.
Anthony's Key Resort of Roatan is an all-inclusive on Roatan and they will again be offering their 2 for 1 special in 2018 which works out the same as "no single supplement" (see the link below) but keep in mind that some of their cheaper rooms don't have AC and that the prices listed don't include the 19% tax (and they may charge extra for Nitrox, I am not sure).
It can be expensive and difficult to fly to Roatan, but Cayman Air is now offering flights from Grand Cayman to Roatan a couple of time a week, and it is often easier and cheaper to find flights from NYC to GC.
50th Anniversary Special | Anthony's Key Resort | Roatan | Honduras
Sunset House on Grand Cayman has been offering a special promotion for single divers for much of this year 2017, see the link below. It ends in mid-December, but you can contact them and see if they are planning to offer it again next year. The high season runs from around January through March so you might have a better chance in April or May. It's not all-inclusive but breakfast and diving are included. There is a 13% tax above the listed prices and an extra fee for Nitrox.
Have a solo trip planned? Sunset House has the answer with big savings
And a lot of single divers find their way to Bonaire and singledivers.com if offering a trip to Bonaire in March that includes options for both single occupancy and same-gender roommate, see the link below.
SingleDivers.com - Bonaire 2018
I hope that you find a great trip!
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