Blog Networking Links  - This is another blog network type of link building service.  Run by one of the top names in the business, and very well priced, it is well worth looking into.  For the cost, this service gives an excellent value, plus it allows you to build unlimited links.  There is some labor involved, as you either have to write content pieces or outsource them, but this solution is priced at a point that should make it affordable to anyone serious about SEO.

120 Links  - This is perhaps the most attractively priced link package.  This is a do it yourself package, but you can build links to an unlimited number of sites each month.  Every month, you get a new package of 120 sites, all high page rank sites, with instructions and screen shots on how to build links to them.  Priced at less than 20 cents per link, this is very budget friendly, plus the service works.

Auto Text Links  - This is a great service, with a wonderful interface.  With access to thousands of sites in almost every niche, you can choose exactly what sites you want your links on, where you want them (content links, blogroll links, homepage links, etc.) and what anchor text you want.  This service is very user friendly, and cost efficient.  The cost is about $1 per link built.  Even better, right now they are offering 25 free links just to try their service.

Professional Link Building Solution  - This link building service is an automated service that will build up to a thousand links per month.  They will not build a thousand links to a single site, however, so you need to have multiple sites you want to promote to take full advantage of this service.  This is really a professional grade link building service, although the price point is very attractive.  For a little over $100/month, you get an automated link building machine.  Choose your keywords, rotate them, track performance and more.