Arkham city won't be less than 5 dollars before next year. It may read 10.60 next year but that's as low as it'll go. FO3 GOTY hasn't been 8 bucks yet there's no reason new vegas would be. Borderlands and fallout are by totally different companies. Comparing them is like saying i got Counter Strike for 5 bucks so I should be able to get modern warfare 3 for 5 bucks.
Are you kidding me? I bought the first Batman GOTY edition for $2.79. All the games I listed above will on some day be less than $5. You just have to be the type of person who checks steam every single day 365. Might be a bit early for Arkham city but I'd wager I get it for less than $5 before the next years xmas steam sale.
On my list I fully expect to see Fallout New Vega for 4.99 at some point before the end of the year. Either that or a pack with ALL the DLC for like 7.99 (which is what I paid for Borderlands w/ all DLC I think)therealFrek