Why not offer a solo ad mailing as a bonus if folks buy one of your expensive products? If your mailing list is of a respectable size that gives mailing list folks one HELL of an incentive to buy from you. Once you begin to build up your mailing list you will soon find that it is no longer manageable by regular email software. In order to get the most from your mailing list you will need to look into using an email list manager.
Most have many features that are very useful for anyone involved in marketing, as it will not only manage your contacts but it can schedule mailing list the regular dispersal of newsletters and promotional material and offers. There are many different software packages available that can do this. Some are web based while others are PC based.
A web-based manager is usually preferable as all of the work is done online; usually a monthly or yearly fee is paid for this service, while some are free and come as part of a Web server package. PC based programs are sold for a mailing list specific price after which they are downloaded and used from a computer. The intricacies of each type of program are varied.