Re: "cheaper" rings and bases
you can "get by" with cheaper stuff.
usually the more expensive stuff is more precisely made (better machining for better alignment) and are made of better quality materials (durability, strength, etc.) along with a more durable finish.
if competing, or if my life or livelyhood depended on something, i'd go with more expensive items (that has a reputation of being what they are worth). as far as casual shooting, you can usually go with cheaper stuff.
the drawback is that you may find that cheaper stuff tends to fail more often, even with casual shooting, then you are back to square one. rather than going cheap, mid ranged priced stuff that's known for a decent reputation is probably the best way to go.
like the saying goes, pay once - cry once.
i know it's tough on a budget, but worth waiting to make a purchase when at least enough is saving to invest in mid ranged priced stuff.