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i have openned a site to sell dresses on line how can i use a catalogue manages to keep my site uptodate , is there anything else avialable like this in the market , something cheaper , i do not want to change my website pages, just want to link them to my site how much will it cost me totaly?

i have openned a site to sell dresses on line how can i use a catalogue manages to keep my site uptodate , is there anything else avialable like this in the market , something cheaper , i do not want to change my website pages, just want to link them to my site
i am actually looking for some ecomerce solution type of thing for my stale site , every timne my products change it is difficult to ask a webdesigner to change thoese items and product features , looking for something where i can just add up and remove the productrs from my webpages
is it available in the market ? from where? howmuch ?
that is all i want to know!