Xero has various different pricing options for your Xero file, depending on how you intend to use it.
The prices below are monthly and exclude GST.
Plans only available via a Xero Partner (Beany)
Non-GST cashbook - basic cashbook for non-GST registered entities and doesn't allow any invoicing - $14 plus GST
GST cashbook - basic cashbook with GST functionality and does not allow any invoicing - $25 plus GST
Other Plans
Xero Payroll Additional Employee $1.00
Xero Projects $10.00
Xero payroll add on $10.00
Xero Starter $31.00
Xero Standard (Discounted) $55.00
Xero Standard $71.00
Xero Premium $94.00
Xero Payroll $76.00
Xero Premium Payroll $104.00
Here is a link to Xero's full pricing details.