UK?
If it is your first year, you are able to revalidate in the sim, so depending for the test you're looking at maybe £300 of sim time plus whatever the examiner charges, maybe another £2-300. Plus any brush up training required.
For reval in the aircraft which would also revalidate your MEP rating, you're looking at more like £6-700 for the aircraft, plus the same examiner fee.
Can be found cheaper, these are probably just above average price.