It doesn't work? If I understand the idea correctly, I am supposed to use the site to find a product I want at a lower price. But when I click on the tags, I am led to a mix of various loosely related products. I clicked "wii" expecting to find the best price on a wii, but instead i get a billion wii video games and wii accessories.
I understand the drawbacks to folksonomy, but ...it undermines your entire concept.
I feel like I'm just browsing a bunch of items, which is pretty boring.
There also needs to be refinement on the product lists. It might help the vagueness problem if you had links that filtered by brand or model. Also there are lot of products that are the same price, so you might need to batch them together.
Overall a useful concept, but tons of work left to actually execute.