Duplicate content, how to solve?

[levalencia1]

I have about 400 errors about duplicate content on my seomoz dashboard. However I have no idea how to solve this, I have 2 main scenarios of duplication in my site:

Scenario 1:

http://www.theprinterdepo.com/catalogsearch/advanced/result/?name=64MB+SDRAM+DIMM+MEMORY+MODULE&sku=&price%5Bfrom%5D=&price%5Bto%5D=&category=

3 products with the same title, but different product models, as you can note is has the same price as well.

Some printers use a different memory product module. So I just cant delete 2 products.

Scenario 2: toners

http://www.theprinterdepo.com/brother-high-capacity-black-toner-cartridge-compatible-73

http://www.theprinterdepo.com/brother-high-capacity-black-toner-cartridge-compatible-75

In this scenario, products have a different title but the same price. Again, in this scenario the  2 products are different.

Thank you

[Red_Mud_Rookie]

To keep your pages and avoid the duplicate content issues i would suggest expanding your product description e.g. 
Dell Color Compatible 3130CN －Magenda with chip 
Dell Color Compatible 3130CN －Black with chip

...those are your produce titles, which is fine, but they are also the in page product descriptions and there is only one word different.

Now the reality... you have over 20K pages indexed so the above approach may not be so practical unless you have a bit of cash to throw at a mechanical turk project that gets all your product descriptions rewritten.

You really ought to introduce something like Disqus that lets people comment on products which in turn would generate a load of unique content, but this would take a long time.

If I was you I would consolidate products like this into a single page with a comprehensive product description and then put a canonical tag on each of the individual product pages so you can still keep them separate, but for SEO purposes you are telling the search engines to pick up one great pages and not loads of poor pages with no unique content.

[SlavaRybalka]

The more pages you have on your website - the better. For every page you want unique title and text/images on page. Create custom description for every product you have on the site. It's up to you how to do it. Also, add Customer Reviews block on product pages.