If you are considering an email marketing campaign then you’ll need to get a good email address list. You can build this yourself from business cards and online research or you can buy a bulk email list from online email address suppliers. You can buy 10,000 email addresses for around £1500 or so.
Quality can be an issue as some lists are unqualified. Ideally find a bulk email supplier who explains the source of the email information. This will give you the comfort you need to use the services of the bulk email company identified.
Some bulk email marketing solutions from email marketing companies do not provide the bulk email list to you. Instead they deliver the email campaign on your behalf. This means in theory that they can maintain the integrity of the overall system ensuring that their email contacts do not get over exposed to email campaigns. You may want to consider whethetr this is an approach you are happy with.
Other providers of email addresses includes directories such as Yell and Thomson Local - though the percentage of contacts in their lists that declare their email addresses can be low.