If you bought something between $5 and $6 (that means, $5.10, $5.20, ... , $5.80, $5.90), would you say
(1a) It cost five dollars something.
(1b) It cost five something dollars.
If you bought something between $20 and $30 (that means, $21, $22, ... ,$28, $29), would you say
(2a) It cost twenty dollars something.
(2b) It cost twenty something dollars.