Are you in the UK (you mention Boots)? I have ordered them off the internet from www.highernature.co.uk where they are £8.20 for 60 caps of 500mg and www.burstingwithhealth.co.uk where they are about £12.50 for 180 tablets or so, but are so huge they are horrid to take (they make me gag). The former are the best I've found so far, but pricey and would like a cheaper (pleasant) source. Holland and Barratt and probably GNC will sell them but probably won't be cheap either.