Allan Gardyne is the founder and CEO of http://AssociatePrograms.com and a bunch of other affiliate-driven websites, including http://PayPerClickSearchEngines.com, http://KeywordWorkshop.com and http://LifetimeCommissions.com. A full-time affiliate marketer since 1998, he spends winters in Queensland, Australia, and summers in New Zealand. Daniel Turner and Marc Lindsay provide a whopping 440 niche articles a month (in each group), so you receive a fantastic supply of articles for your website or blog or autoresponder or whatever. Membership in each group is limited to only 200 people, so competition is strictly limited. These guys are professionals, providing a very good service, including a helpful forum. UPDATE: Huge improvements and new services are being planned, to make things even easier for you.
Bobbie McKee provides both PLR articles and PLR ebooks. Each month, you get 400 fresh articles spread across 16 hand-picked niches. You also get 3 private label ebooks including sales letters, 13 ready-made niche AdSense websites covering 13 topics, 13 website header graphics, and an unlimited domain hosting account. As well, you get access to a heap of ebooks and software with full master resell rights. There's a strict limit of 350 people per article set. As you'd expect with PLR sites, the quality of the writing varies in different niches. Most of the articles I examined looked good. This offer is good value.
Dave Markel offers packages of good quality niche content articles at a bargain price. You pay only 75 cents per article. The sale of each package is limited to 300 people. Dave shows you samples of the articles. (He used to have a membership site and switched to providing packages of articles.) This is excellent value.
Kim Standerline covers in-demand health niches. Each month, she provides two complete health niche products written by a registered nurse, 25 private label articles, keywords research for each niche, a private forum, bonuses, and all sorts of useful assistance. Check out all the details on the site. If you're interested in health, you'll love this service.
Bryan Winters provides a huge article database. Members get unlimited access to over 40 niche categories and hundreds of topics. You also have access to niche content article packs and private label products with the sales letters already written for you. You can post "articles wanted" requests. You can get paid for writing articles. There is no restriction on membership numbers. The membership fee is modest.
Joel Osborne provides 150 new private label articles every month. The articles have never been used before. Membership is limited to 250 people. UPDATE: CLOSED.
Constant Content. Prices I saw varied. Some are free. Some cost from $5 to $20 an article. If you spend more and buy unique rights, the article is removed from the database. A counter shows you how many times the articles has been downloaded. New articles are added frequently. If you can't find what you're looking for, you can submit a request (2500+ writers waiting).
When you join any of these PLR article sites, be sure to read the terms carefully. They vary slightly from site to site.
How to avoid duplicate content filters
Search engines inevitably are getting tougher and tougher on duplicate content. If you ignore this fact, you risk seeing a whole lot of your work go down the drain.
If you buy PLR articles never simply use them unchanged. That would be asking for trouble. Here's a good tool you can use to help you rewrite articles to avoid duplicate content filters.
For best long-term results, ALSO do your own research, add your own comments, add your own tone and personality, and make your site genuinely USEFUL so that people will want to recommend it.