score:7
I live in Turkey and travel to Bulgaria regularly. (~20 times now). My general idea would be that this might be easier to find in Bulgaria as long as you were in one of the major cities. Turkey doesn't seem to have this stuff just anywhere.
That being said, it's cheap-ish generic gear can be found at some major markets in Turkey, so I'd be inclined to hit up a few stores and pick something up before I hit the road.
Upvote:3
I do not know Bulgaria well but I can tell you where you should look at for this kind of outdoor stuff.
KarakΓΆy is the best neighbourhood for buying outdoor and camping gear. You can find famous brands for good prices and average equipment for less. There are tens of outdoor shops there.
Do not forget to negotiate the prices since there is at least 30% discount margin if you are paying in cash.