I'm using a Rep2, with 1.75mm filament. That gives me something ridiculous like 330 metres or so (give or take, 1000ft). I'm yet to finish a roll - I have about 6. Being like Old Man Emu, I'm based in Australia, so my costs are a little bit pricier, however I usually use Bilby brand PLA which is $40/roll (more for tricky shit like glow, or timber). To put things in perspective, I've printed multitudes of ships from Eve Online in a multitude of colours, and still yet have to run out of anything. Including several test prints, and a few failed prints!