Ok, so it might be something like this..
- the select part can be whatever data u need the user to see or need to mani..
- i don't know what your table is called so i used vacationtable )
SELECT tripname, description, price
FROM vactiontable
WHERE region = "$region"
AND country = "$country"
AND cost < "$cost";
i am assuming you know how to perform the SQL query etc..
of course this might not be exactly what you need but it would be something similar, hope it helps you a bit.