As of late, to the best of my knowledge, are prices for the upper-midwest near Illinois and Wisconsin.
Weed (schwag)--$60 / ounce
Weed (da kind, beautiful sticky white and green nugz)--$300 / ounce
Cocaine--$90 / sixteenth or up to $100 / gram depending on quality
Meth (basic crank)--not so prevalent anymore since the ban on selling pseudoephedrine without asking the pharmacist and signing a tracking sheet. I haven't touched meth since 2004, but I still know the prices--$60 / gram
Crystal Meth (ice, glass; nice clean sparkly crystals): $50 / quarter gram
Ecstasy--depends on dealer but most X dealers know that people will buy it at atrocious prices. Best deal I ever found was $20 / two pills
Heroin--varies as well. Average prices are $30-60 / quarter gram
Pharmaceuticals:
Adderall / Dexedrine--$2-6 per pill, depending on mg strength
Benzos--not many people sell benzos regularly, but some do, and I happen to know one. For all benzos being sold on the streets, prices range from $1-4 per pill, depending on strength and specific type of benzo
Ritalin--$1-4 per pill, depending on mg strength
Opiates:
These get a paragraph dedicated to them because most, if not all pharmaceutical opiates are priced sickeningly high on the streets.
Hydrocodone--$2-5 per pill, depending on mg strength
Oxycodone--sometimes up to a dollar per milligram. Ridiculous

Dilaudid--$2-8 per pill, depending on mg strength
Morphine: $4-10 per pill, depending on mg strength
Fentanyl (patches)--roughly $1 per mcg.
Fentanyl (lollies, lozenges)--priced like OC, stupid