We're piggy-backing off one of our player's Dreamhost setups; his is around $14 per month, if you want to get all fancy and have webpages and databases and emails plus Wiki.
That's using MediaWiki. It's a little much for a game wiki, but I'm used to using it, so it wins by default.
I also run a secondary MediaWiki off my Linux firewall at home for personal d20 projects; slaving Apache to a nonstandard port and limiting traffic to my IP at work. Wiki's mostly text; the slow upload of a cable modem doesn't hurt too much. Your main issue with that would be a dynamic dns service if your IP changes a lot (aside from the hassle of having the Linux server itself) The cost of that is broadband charges + assoc. electricity; a pretty low-end machine could do it.
That's using MediaWiki. It's a little much for a game wiki, but I'm used to using it, so it wins by default.
I also run a secondary MediaWiki off my Linux firewall at home for personal d20 projects; slaving Apache to a nonstandard port and limiting traffic to my IP at work. Wiki's mostly text; the slow upload of a cable modem doesn't hurt too much. Your main issue with that would be a dynamic dns service if your IP changes a lot (aside from the hassle of having the Linux server itself) The cost of that is broadband charges + assoc. electricity; a pretty low-end machine could do it.