yes $400 is a low ball for a VFC. A buddy picked one up for $350 but it needed a bunch of work to get it going again.
Even in the states I have seen used VFC's around the $350 mark so here in Canada I would say more the $600 range then start adding from there depending on upgrades/accessories.
I would def suggest getting AV'ed as you are 18+ and start looking in the classifieds. You might get a bit of a better deal around this time of year to.