You can get Algin from Laura or Russ. If you're not a vegetarian, then I think it will be hard to find the equivalent at the same reasonable price.

I've been looking everywhere for Algin and had a real difficult time finding products. I can't find any at all here in Britain. There are some slightly cheaper Anerican products like Solaray>SP-25 Detox Blend (Algin Blend) (100 capsules) or Solaray>Comfree Pepsin with Algin (100 capsules) but I don't know how suitable they are and I don't think they are suitable for vegetarians (gelatin isn't suitable for vegetarians).

The only one I can find suitable for vegetarians is a product called ProAlgen (alginate with Milk Thistle) so I have little choice but to try that. (It's either that or the sodium alginate powder.) Quite pricey for a bottle though, $25-30.