If it's a case of already having a copy of it at home that you'd like to use instead of buying a new one, then look into one of the free online suites, like ThinkFree, Google Docs or somesuch. Especially if you're not doing anything particularly complex.
If it's a case of already having a copy of it at home that you'd like to use instead of buying a new one, then look into one of the free online suites, like ThinkFree, Google Docs or somesuch. Especially if you're not doing anything particularly complex.