The sites are American but the pronunciation is very similar to what you would find in Saskatchewan.
Diagnostic Exercises
Click here
American English Pronunciation Practice
Game-like Minimal Pair Practice using Flash and MP3 Files: Click here
Daily Pronunciation Practice--Listen and repeat to improve intonation, rhythm and pronunciation: Click here
Listen and Repeat Podcasts: click here
Videos
L and R - Part 2 - Exercises - English Pronunciation Practice (ESL)--click here
7 Commonly Mispronounced English Words (ESL) - American Pronunciation--click here
'th' /θ/ & /ð/ vs. /s/ & /z/ - American English Pronunciation Lesson--click here
Minimal Pairs
One-Syllable Initial T/K Minimal Pair Picture Cards