What is an unbra?

What brands of backless bras are the cheapest?

Backless bras are widely known for being unsupportive, and cheaper brands will lack the sophisticated techniques that the more high end models use. Therefore, it is perhaps not a good idea to choose a backless bra solely on price. However, the brand "Fashion Forms" make low cost backless bras, or the brand "Unbra" is available for as little as $10, although this only comes in smaller cup sizes.