Global Product Update across Multisite Network

We run a network of about 100 websites offering digital downloads, all offering the same products.

Correct me if I'm wrong, but we found it wasn't easy to pull all of the categories and products from the main store and share them across the network (We need each website to have a complete sitemap of categories / products), so in the end we cloned the main store across the network. So we now have 100 "independent" instances of Marketpress across 1 network.

So far it's been good, but now we need to adjust pricing add coupons, etc. We're trying to figure out if there's a shortcut as opposed to manually changing the pricing on all of our 80 products across 100 stores. I'm sure this could be done with a database query, but wanted to see if there's potentially another solution.

Thanks for your help / ideas.

Cheers!