Denise, follow the link on my post above - then look on their 'Categories' menu, then look at MP Essentials drop down menu on the left, check at bottom of drop-down menu for 'Protein Powders'. Look for Impact Whey as it is low carb, hi protein.
If you want to try a few flavours first, check out their sample page. Impact whey is around 99p/1.29 per sample if I remember right.
Service is very reliable from them and I usually get my order within a few days.