=== Commercial offers
* Aruba Cloud (low cost for the Italy based service provider [https://www.cloud.it/cloud-computing/calcola-costo-cloud.aspx# |Calcola il costo del tuo  Cloud]): 
  1. from the website of a commercial collaboration sw (Polycom) I've derived the minimum requirements for the full suite of tools - web conferencing, sharing and collaborative apps (from Data sheet:
http://www.polycom.com/content/dam/polycom/common/documents/data-sheets/polycom-realpresence-web-suite-data-sheet-enus.pdf) and estimated the cost per month offered by a cheap Italian provider, since Amazon require a long registration process and too much details:
 RealPresence Web Suite Pro License
                -  Services Portal–8 virtual cores, 
8 GB RAM, 100 GB Storage
(Aruba cloud offer: 152,640 Euro per month 187,200 Euro with  Windows license)

                -  Experiences Portal–8 virtual core, 
16 GB RAM, 100 GB Storage
                (+ 175,680 Euro)
                -  Standards Connector–4 virtual cores, 
8 GB RAM, 100 GB Storage
                (+ 95,040 Euro)
                -  vSphere 5.5, 5.0 or 5.1
                -  Windows Hyper–V Server 2012 & 
Hyper–V 2012 R2 

it is 500 a month so at least 6000 a year just for the machine and standard maintenance.

(see also: [https://www.cloud.it/cloud-computing/listino-prezzi.aspx | Listino prezzi]).

* Amazon 
Here the link to have the Amazon offer (a bit higher: $ 1279.97 per month) for a typical set of requirements (to be checked, I couldn't specify analitically the requirements simply choose a template: Social Media Marketing Auto Scaling Web Application in 2 AZs) for a server based in Ireland: 
3 Web servers of 2 virtual cores, 8GB RAM, 500 GB storage each
2 App Servers of 4 virtual cores, 16 GB RAM each
2 Database Servers of 4 virtual cores 16 GB RAM each 
15 GB of Data Transfer 30 GB od Data Storage and Backup.
Amazon (Ruby on rails) application that serves approx 200 concurrent users
[https://calculator.s3.amazonaws.com/index.html#key=calc-430BFF5F-53F3-4FFE-BDFE-D5884156E3BD&r=DUB | Amazon WS Simple Monthly Calc]