Must buys...
Spices, many taste much better over here (as they are fresher) and are MUCH cheaper. Also simple things like Garlics seem to be much better here and last longer
Honeybee, just because it is so cheap, also Vodka etc cheaper over here, although don't agree with the whole Fenny thing... Not really nice...
Soap, toothbrushes etc much cheaper.
For the artists, good pencils, chalk etc are SO cheap here in comparision.
Also pens, markers, Diaries etc too...
Books, computing books are SO cheap here, but can weigh a bit.. other books available too....
Local food from the roadside, chicken rolls (Mapusa, near the bus stand in the evening) - or from royal foods, samosa's, the dairy in Calangute are good, egg roll, near fish market in Calangute, don't know what they're called but a plate with potatoe balls wich bombay type mix, apple sauce, chilli etc put on top (10 rs) and they're lovely!, in Panjim, near the fruit market there's a drink stall (small thing on wheels) which makes a FABULOUS fresh lime soda for 7 rs (was 6rs but put his price up :o(), inside the market there is also a great place for banana milkshakes...
Cinema ticket, Panjim has a lovely cinema, got to be tested just as they sstand up for the national anthem... By the way if there's any mildly rude bits in a film they'll get removed so best watching PG films... :o)