You can buy accounts for pennies(literally) linked to @outlook.com on blackhat marketing websites. You can also buy the tools to administer all of them.
£500 (estimate) would get you from black hat marketeers:
- 200 twitter accounts (new) - you can also get aged ones but more expensive - bot
- around 25-100 proxies to rotate when posting (depending on quality 25 would suffice)
- someone to do the work for you (a part time PA)
- a win VPS to run it all