Is there any way to find cheapest deals without using deal finder?

No, there isn't unfortunately. It should be back up soon though.

Well, you could do it manually but that would take ages, a millenia maybe...

However, take a look at the best sellers, some of them got nice prices on their items.

Yeah, also you could check out the #Market IRC channel to get some general price advice, if you normally use Deal Finder for that.

Or theres a search bar right above the list of stores. You can click it to shop content and search the item you want.