Ebay has syringes for around 2k or so.
Here's one.
As for the hot air guns, I spoke to the electronics man, his response was "pita kotuwe ona kadayaka thiyanne ona". Basically most shops on 1st Cross Street should have them, but the hot air guns he's knowledgeable on are the kind used for soldering electronics (SMDs and what not), so they're pretty pricey @ 10K+. He hasn't come across the general purpose kind, but suggests that you check Robert Agencies and Unitech to begin with.