Maybe worth checking your local china town. We went to londons and while waiting to see the new bond flim at lecister square we walked up a side road in to china. The shops there have lemon grass,tarmind, pak choi and millions of other things the wife required they may well have calamansi as well im not sure.
i know calamansi juice in a bottle is avaiable from our local phill store but nothing beats the real fruit.
