It's expensive here in the US too
VSL#3 has been good for me. I originally took a basic acidophilus probiotic (refrigerated high quality) but didn't see any noticeable results so decided to try VSL#3. It seems to help regulate my constipation. And I also have started adding it to my homemade yogurt, both as the batch is "cooking" under the stove light (it makes the yogurt much thicker) and also sometimes add a packet into the yogurt I'm eating.
My only med now is Balsalazide.