Yeah it does seem a bit cheap. I actually didn't know untill yesterday when i was leveling my hunter in Tanaris and stopped to have a look at the gear they were selling. Good thing is if you intending to PvP when you are 80 then you can just send the heirloom honor items to your alt then buy the whole set and do the last 10 levels in the battleground. It would take a while though lol, still it would be fun imo.
Actually most of it is still in the game, you just have to work to still get it.
on isle of quel'danas
S1 Gladiator 5 piece set is available for T5 badges
- from vendor KARYNNA
S2 Merciless Gladiator 5 piece set is available for T6 badges
- from vendors OLUS and SORYN,
Veteran and Vindicator items
- from vendor KAYRI
vendor SMITH HAUTHAA has some decent weapons for badges of justice which can be obtained using dungeon finder .
S1 and S2 weapons are gone
S3 gear and weapons are gone
S4 Brutal Gladiator 5 piece set, weapons, etc gear is available still at area 52 and gadgetzahn, but you will have to be on a arena team to earn points to buy
you can also use T6 vanquisher badges to buy T6 gear at vendors TYDORMU, THEREMIS. the gear they sell has some killer stats and bonuses and can be easily gemmed for resilience
PVP cloak, belt, rings, neck, boots are still available in SW or Org at PVP vendor for honor and marks
in shatt there is vendor ANWEHU who has same items as SMITH HAUTHAA
also in shat G'ERAS who has several PVP trinkets and some items that are PVP viable like the cloak DORY'S EMBRACE, etc.
of course if you are flashing thru the game and going to 80, there is no reason to grind BC heriocs, PVP, or Arena. many of the WotLK greens and blues whether quest rewards or drops rival many BC epics.
You can still get level pvp sets for level 70. From the legacy armor vendor in Dalaran in the sewer arena area. NPC is in one of the buildings at the far end. All pieces (cataclysm) are between 100 to 200 honor points only. Weapons are more but neither use arena points anymore.