the first thing that came to mind for me would be an angle grinder, but I'm not sure if it's the best tool for as many cuts as you are looking at! I kinda hate to recommend them, because their quality is *VERY* spotty... but in a pinch harbor freight can give you a good solution at an affordable price.*
$85.00 for a miter saw: http://www.harborfreight.com/power-tools/miter-saws/10-inch-compound-miter-saw-91995.html
$22.00 for a grinder: http://www.harborfreight.com/power-tools/grinders/heavy-duty-4-1-2-half-inch-angle-grinder-91223.html
$30.00 for 42" bolt cutters: http://www.harborfreight.com/hand-tools/bolt-cutters/42-inch-bolt-cutters-41151.html
Anything from Harbor Fright with bits or blades, I buy nicer ones from a hardware store because they generally won't last. That personal rule makes me wonder about the bolt cutters, too. Also, it's pretty easy to find coupons for HF that makes it even cheaper.
For some extra money, all of those items could also be picked up at home cheapo, lowes, sears, etc.... The ultra budget learn to hate the job would be a hacksaw.
[size=5pt]*of course this may or may not be a result of slave labor in china or terrible environmental oversight - but then again this may be the case with a large number of items we buy these days, not necessarily harbor freight specific.[/size]