Monokini swimsuits are available for purchase directly from the Monokini website. There are many styles and colours which one can choose from. Monokini ships orders internationally.

A typical monokini swimsuit looks like a regular bikini with a strip of fabric connecting it. That type of swimsuit has more coverage than a regular bikini but not as much as a one-piece.

you could try Amazon. there is only a few though :(

In the 1960s a monokini was just the bottom half of a bikini, i.e. going topless. I understand that, in present times, a monokini is a one-piece swimsuit, but cut out so that the bra and pants parts are barely linked.

BGB's Monokini Swimwear, Guess, and Maya offer the most practical verisons of this suit.