Dallas, Texas as of April 2007:
Marijuana
1/4oz - $20, 1/2oz - $30, 1oz $50, 1lb. $300 - $450
(Average to Above average quality)
Hydro Budz 1/

z - $50 - $75, 1oz - $300 - $400, 1lb - $1800 - $3000
(High-Times Grade)
Heroin
"Street Corner Dope" South Side/West Side lowest level (AKA "Boy")- $5 per #5 capsule (capsule slightly smaller than a Benadryl capsule, generally never greater than 10% purity) Light brown powder composed of Black Tar cut heavily with diphenhydramine (Dormin or Brand-Name Benadryl for solubility)
"Street Corner Dope" East Side (AKA "Chiva" or "Chicle") $10 per .1g,
$80/gram, $150-$225/3.1grams AKA "A Three-One" - This is Black Tar, 45% - 70% purity
"Colombian White/South American Scorpio" Must be well-connected (and use caution)-- very light off-white powder (easily mistakable for Cocaine) -- $50-$75 per .25g -- $200-$400 per gram; Purity has been confirmed at over 90% in most cases, as it is rarely stepped-on due to the desire of the reputation of the dealer being held highly.
Cocaine
"Street Corner Blow" (AKA "Girl" $5-$7 per #5 or #4 capsule, generally no more than 25% purity) Common purchase is a "Two and One", or, Two #5 capsules of Heroin and one #4 Capsule of Cocaine for $15.
Crack
"Street-Score" - You never know, really, but: $5-$10/.05g-.2g, "Fifty-Flippers", or $50/2g available if you can get in the trap instead of stopping on the block.
Off the streets and into the connections, Cocaine is more often than not left "uncut" insofar as remaining at the same purity level in which it enters the border in stamped kilo bricks; $20/.5g , $40/g, $55/16th oz., $90 - $100/8th oz. and $500 - $700/oz. -- Kilo Bricks $14,000 - $19,000 (4 hour drive vs. "In town")
Methamphetamine
"Red", $25/.2g or $80 - $120/gram
"Annhydrous", $20-$30/.2g or $80 - $120/gram
"ICE" $20/.3g , $70 - $90/gram , $900 - $1300/oz., $8,000 - $11,000/lb.
Ecstasy
$12 - $20/pill, $90 - $100/ten-pack, $650-$800/hundred-pack,
$3,200-$4,000/"K-Pack" or 1000 tabs.
LSD
As much as $20/hit, though usually unheard of, unfortuately; Quite unlike just a few years ago.
Pharms
Xanax 2mg "Handlebars" $5/ea. - $200 - $300/hundred -
$750 - $1100/thousand
Valium 10mg $3/ea. -- $75 - $125 per 90ct. bottle (Roche 10) $650 - $1000 per thousand ct. bottle (Roche 10)
OXYContin +/- $.30 to $.75/mg.
Methadone liquid dose $.50-$.75/mg, 10mg tablets $10/each to $500 per hundred ct.
Exotics:
Club-Kid prices and no reliability; Generally a "dose" of anything can be found for $20.