Tons of useful recipes in the LowCarb Kitchen: Recipes Forums, and in the Kitchen Talk forum, too. Or you can add LC goodies to some of the premade ones, particularly vanilla protein powder, which is a premade "shake" product after all.
Lots of good quality premade stuff in the Health Food Stores, even GNC though they're expensive. Over here on the Island (talk about the hinterland!) there's even a store called Popeye's Supplements, mostly frequented by bodybuilders, but
I'll go in there, that has a WALL of different protein powder ("shake") products available, and a goodly portion of them are low carb and sugar free. Some brand names to look for are: Iso-Whey, Designer Protein, Kaizen...they'll seem expensive but check the number of servings ... you've got to remind yourself that quality protein is expensive and nutrient deficient sugars and starches are cheap -- and fattening! Always check the nutrition facts and ingredients list on the back, don't go by the front. Whey Protein Isolate (vs. soy or other isolates) is top quality. 1 to 3g per serving max and you're on a roll.
The new fruity/clear ones are excellent! Performance Protein Fruit Blast comes to mind.
I've also found protein powders in London Drugs, Shopper's Drugmart and even the pharmacy and/or diabetic sections of Walmart and Zeller's.
No shortage of options here in the hinterland!