After falling to below $20 ZWL on Friday and on Monday morning the black market rate seems to be now hovering back above $20. It reached a peak of $20.70 on Tuesday before falling somewhat to around $20.40 ZWL per USD yesterday in the afternoon.

OMIR26.73
USD / ZWL$ zimrates.com20.4
USD / ZWL$ zwl365.com20.5
USD / ZWL$ bluemari.info20.5
USD / ZWL$ rbz.co.zw15.77
USD / BOND zimrates.com13.2

What banks and exchanges are paying