Mezzo Host is a paid MediaWiki hosting service based out of Canada. The service offers 4 plans, the cheapest one costing $79/yr or $24.95/quarter* - something that many hosts don't offer. Many hosting providers only have a monthly or an annual fee, not a choice of costs within a choice of plans. The servers are optimized for maximum MediaWiki hosting performance and stability. The PHP and MySQL security is perfectly enhanced for MediaWiki powered websites. The MediaWiki hosting plans include regular backups, with knowledgable staff with MediaWiki website experience.
*Quarter = 3 months