That's about right. Some developers have them on their site, but you may have a tough time if you're looking for a lot.
Also, if you do find them, I've never been able to get Safari to download .deb files. I don't know if there is another way, but I use the Safari DL plugin and it says Safari can't handle .deb files when I try.
But, you can download them using MobileTerminal and wget by running "wget http_link_to_deb" or by pasting them to a text file, one link per line, and using "wget -i name_of_file"