Brunswick's entire BVP series qualifies. You could make yourself a nice arsenal from just those balls and compete anywhere.
Interesting that someone should jokingly mention Lane #1 because in a couple of occasions, it happens to be true: XXXL and Liberator, especially the XXXL. There are guys I've bowled with who badmouth Lane #1 mercilessly but when the black XXXL came out, I could walk up and down the house and see XXXLs peering out from bags all over the place.
Biggest single ball in this category in the last 5-10 years, though, may be the AMF Orbit Extreme. It has a real core and wears SuperFlex, and sold at most pro shops for $100 or less.
In general, though, the comment about entry-level equipment in general is accurate. Most all equipment is so good these days that there are very few bad balls, even at the lowest levels.
Jess