AdeV,
Before you go considering tools from places like car boots, if it ain't in it's protective box or packaging, leave well enough alone. Unless of course you possess a tool and cutter grinder.
I have thrown away better than most you see at places like that.
If they haven't had the correct protection during their life, you can almost guarantee they will be dull, and absolutely no use for anything other than grinding up to make a centre punch out of.
I have seen boxes upon boxes of drills, reamers, taps and dies, all piled together, so don't even bother rooting thru them, they are worth nothing more than their scrap value.
On the other hand, I have bought boxes of brand new and protected tooling from car boots, and found them to be ideal, just don't ask where they came from. But they are very rare finds nowadays, in fact I don't think I have bought anything concerning cutting tools for at least a couple of years, maybe longer.
If you are tight on finances, then you will be much better off saving your pennies, and buying new individual ones only when they are required. If looked after, they should last a lifetime with the sort of work you will be doing.
It is truly a false economy buying old junk tooling, and having to throw it away or stick it under the bench, after you have ruined a perfectly good job with it.
Bogs