THE TWO BEST BUDGET DECKS ARE TERRAKION AND ZEKROM, THIS HAS BEEN THE CASE FOR THE LAST THREE MONTHS AND NOTHING HAS CHANGED AT ALL!!!
Of the two, Terrakion is more expensive as far as the pokemon go, but will still be relatively cheap and you can always annoy people and try to buy Terrakions at $2-3 (and will eventually succeed, trust me). If you are just looking to buy online, I would go with Zekrom instead. Zekrom + Terrakion is also an okay option to mix together.
1 Smeargle $2
4 Zekrom $4
2 Thundurus $3
2 Tornadus $3 OR 2 Zapdos $1
4 Tynamo $1
3 Eelektrik $0.75
4 DCE $2.50
9 Lightning $2
4 Dual Ball $2
3 Level Ball $1.50
3 Juniper $1.50
4 PONT $3
3 N $1.50
3 Random Receiver $3
2 Plus Power $0.50
2 Switch $0.50
4 Junk Arm $14
3 of Pokemon Circulator/Pokemon Reversal $0.75
Well... I don't think Durant is just a fun deck. I don't think Cinccino is uncompetitive, and I don't think ChandyTales is too shabby either. I think all of them are capable of top cutting (obviously Durant is, even with Heatmor). I can't say I think they'd all take a tournament, but I certainly don't underestimate their potential either. I know from playing my friend against his Cinccino deck that it's actually not terrible (no matter how flippy it sounds). And I've taken top 2 or top 4 at shop tourneys with ChandyTales, and know people who have whiffed on resistance for Top Cut that played it during States/Regionals.
But yeah, I should do up budget lists of Mono Terrakion and ZekEels. I was hesitant because Catcher in those decks is really more essential, and since your post implies you think that budget Zeels is more competitive than the above listed options, then I'll just say that a Zeels running Reversal is not going to be doing better than a deck like ChandyTales or Cinccino. And if you do include Catchers, it's still in the same price range but I'd still say it's onot going to be doing much better than a deck like ChandyTales or Cinccino (and ChandyTales would benefit strongly from including something like a couple catcher as well). But if I'm including decks like those of course I should include budget Zeels and Terrakion (and was planning on it, but hadn't gotten around to it. I don't really play either of them so I wasn't thinking about them much).
And I'm not using T&T to say that people should buy from it. It's just good to have a set standard when comparing prices like this. So we can go to the same source that's generally the best simple* comparison tool on the web. I could probably add into the first post though that you can find cards cheaper in person/on eBay for the most part. But for the sake of the discussion we shouldn't use the "you can always annoy people and try to buy ________ at 30% it's T&T price (and will eventually succeed, trust me)" line ever, since the same logic applies to saying that you can get a Mewtwo EX for $25 if you just keep trying (and my friend's done that).
Mind if I do up a post using your Zeels deck :)? Or if you want to prettify it feel free.