Cost varies with many factors - such as numbers of users, data migration, validation requirements, level of consultancy required, etc - and it is impossible to provide an accurate "standard quote"; discussing cost ahead of requirements is also somewhat counterproductive, as numbers don't have much meaning without an understanding of what value is being sought and delivered.
SaaS
For a typical small-to-medium company, initial set-up costs would be in the region of £5,000-10,000. Monthly application rental is then banded by numbers of users, starting at £365pcm for 1-5 users; monthly hosting depends on your company's requirements, but is likely to be in the region of £550pcm.
Installed
A typical quote consists of licences (including configurations) - both server and users - customisations, data migration, systems integration, project overhead, documentation, training and support (charged annually at 15% of licences, customisations, integrations and data migration).
We aim to make as many of these items as possible to be fixed price, but without exploring requirements with you, we are unable to quote for items such as customisation, data migration and systems integration.
A small, departmental solution with minimal data migration might cost as little as £25,000; a global solution, with full validation and significant data migration could cost upwards of 10+ times that figure - most installed systems will fall somewhere in the middle.