Data Feed Review

I have been using Google Feed for a while, get some customers from there but it the only free feed I know of.
-What are some other free data feeds to get my products out there?
-What are your review/experience with yahoo shopping and shopzilla.com etc.? Shopzilla seems expensive $100.00 being their minimum payment, so bots can click on my ad and Ill keep having to pay or does it have to be a successful checkout?
-I see pet supplies, which is a big market, alot of stores to compete with. My prices are very low, I just need to get out there, any advice?

anyone?

How long has your site been on line? There are tons of free feeds out there, you'd just have to Google to find them. usually a pay per click is just that. So you pay for each visitor coming to your site whether they buy or not. If you are interested in PPC I'd recommend Adwords but you will still have to pay for competitive key words.

In my experience, Organic SEO is still the best way to go.

I was wondering if someone know what technology, feed does deal/coupon site use to update their site daily. site is not so hard to build but the feed is what makes the site update and all. can someone give good recommendation