My partner lived on these in Singapore! The icecreams cost $1 Singapore and you get a thick rectangular chunk of yummy icecream wedged in between two wafers (or rainbow bread…but I eat so slowly I imagine it would go soggy for me :P). They had all kinds of flavours, from the traditional chocolate, raspberry swirl, mocha chip, to Durian, Honeydew, Red Bean and the Sweet Yam in the above photo (yes, it is purple, and yes, it is actually really nice!).
You buy the icecream from street vendors like in the photo above. We found several vendors along Orchard Road, and there are often about 3-4 on Clarke Quay near the Swissotel Merchant Court (where we stayed). To get to the part of Clarke Quay I am talking about you can just get the MRT (mass rapid transit = underground train) to the Clarke Quay stop, then follow the signs that will take you to the Clarke Quay exit.
If you go to Singapore, make sure you get some of these cheap yummy treats. You will definitely feel like it with their hot weather!