Bryan,
I agree, don't buy leads. Most of that is a junk list anyway.
You'll either get flagged as a spammer or you'll have an incredible opt out ratio. However, if you're looking to get word out to a lot of "buying" prospects then you really want to look into ezine advertising.
You want to do solo ezine advertisment in the targeted ezine publications. And this is very important, DON'T go for the largest list.
I know that sounds strange but trust me on that one. You want to stay under 100,000 because, most list above 100K are filled with unverified (and therefore, unqualified) prospects. Smaller lists are maintained better. You might email a 500,000 ezine and only make 15 sales while emailing a 55,000 list my get you 100 or more over time.
You can find a list of top ezines at www.ezine-dir.com for free. But, if you want a much more effective solution, I suggest you find $197 for a lifetime membership at www.DirectoryOfEzines.com. This is a very respected site and you can really find the best ezines listed by subject matter, list size, ad costs and so on.
Also, when it comes to ezine advertising, never by the classifieds. You'll just waste your money. The only advertising you want to buy are solo ads.
Typical conversion rates from solo ads are between 5-10 sales per mailing for a good product and you'll pay only $50 (a lot of times) to email up to 90,000 people. If your product is $50 and you receive 90% of your profits then you can make you money and then some in no time.
But, off the top of my head, some good ezines to go with for home business: BizOpEzine (80,000), Online Business Opportunities Newsletter (62,000 sub), Affiliate Junction (61,408 sub), DEMC E-Magazine (48,000 sub).
These are good ones. You can google them to find their web addresses.
Hope this helps...
By the way, I am NOT an affiliate of any of these companies and I'm not making any money off of these sites.
Stephon